BOSSCO ME-90 User manual

01
Parameter Guide
© 2023 Roland Corporation
Contents
Eects .................................................2
Eect signal chain ..........................................2
COMP/FX1 (compressor/eect 1) .............................2
Compressor/eect types ....................................2
Knob functions ............................................3
OD/DS (overdrive/distortion) ................................5
Overdrive/distortion types ..................................5
Knob functions ............................................5
MOD (modulation) ..........................................6
Modulation types ..........................................6
Knob functions ............................................7
DELAY .....................................................9
Delay types ...............................................9
Knob functions .......................................... 10
PREAMP ................................................. 12
Preamp type ............................................ 12
Knob functions .......................................... 13
NS (noise suppressor) ..................................... 13
EQ/FX2 (equalizer/eect 2) ................................ 14
Eect type .............................................. 14
Knob functions .......................................... 15
REVERB .................................................. 17
Reverb type ............................................. 17
PEDAL FX (pedal eects)................................... 18
Pedal eect types ........................................ 18
System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Conguring the system settings............................ 19
Preset patch list .......................................21
Company names and product names appearing in this document
are registered trademarks or trademarks of their respective
owners.

2
Eects
Eect signal chain
The signal chain (how the eects are connected) on the ME-90 is shown below.
PEDAL FX COMP/FX1 OD/DS PREAMP
SEND/
RETURN EQ/FX2NS FOOT
VOLUME MOD DELAY REVERB
Guitar Guitar
amplier
The signal chain is automatically optimized to match the eect type that’s selected. You can insert the SEND/RETURN after the PREAMP.
COMP/FX1 (compressor/eect 1)
Averages out the volume, giving a sustained sound without distortion. You can also select from a variety of unique eects.
In manual mode or in memory edit mode, you can turn the eect on/o with the number [1]/[COMP] pedal.
Compressor/eect types
Eect type Indicator color Explanation
1. COMP Blue Makes the sound sustain without distorting. This also works as a limiter to suppress high volume
input.
2. T.WAH UP Blue Gives a wah eect according to the dynamics of your picking. The frequency of the lter rises.
3. SLOW GEAR Blue This produces a volume-swell eect (“violin-like”sound).
4. DEFRETTER Blue This simulates a fretless guitar.
5. OCTAVE Blue Adds pitches one and two octaves lower.
6. HUMANIZER Blue Alters the guitar tone to make it sound more like a human voice.
7. FEEDBACKER Blue Generates feedback performance. The eect is applied while you hold down the pedal.
8. AC SIM Blue Alters the sound from an electric guitar to make it sound like an acoustic guitar.
9. SOLO Blue Use this in combination with the OD/DS or PREAMP eect for a sound that’s optimal for playing
solos.
10. TUNE DOWN Blue Gives the eect of tuning your guitar lower.
11. S-BEND Blue Gives a pitch shift up/down eect that’s not possible when using typical guitar vibrato bar
techniques. The eect is applied while you hold down the pedal.
You can use the BOSS TONE STUDIO for ME-90 dedicated app to exchange the 11. S-BEND with the following eects.
Dierent settings can be made for each patch.
Eect type Indicator color Explanation
D-COMP Blue This models an MXR DynaComp.
RING MOD Blue Combines the internal oscillator and the guitar tone to create an atonal, metallic sound.
POLY OCTAVE Blue An octave eect that works with polyphonic input.
T.WAH DOWN Blue Gives a wah eect according to the dynamics of your picking. The frequency of the lter falls.
Single > Hum Blue Makes a single-coil pickup tone sound like a humbucking pickup tone.
Hum > Single Blue Makes a humbucking pickup tone sound like a single-coil pickup tone.

3
Eects
Knob functions
1 2 3
Eect type
1 2 3
1. COMP
SUSTAIN
0–99
Sets how long the sound rings out
(sustains).
ATTACK
0–99
Sets the attack time of the sound.
LEVEL
0–99
Sets the volume.
2. T.WAH UP
SENS
0–99
Sets the input sensitivity.
TONE
0–99
Sets the tone (brightness) of the wah
eect.
PEAK
0–99
Sets the strength (character) of the eect.
3. SLOW GEAR
SENS
0–99
Sets the input sensitivity.
ATTACK
0–99
Sets how long it takes to reach maximum
volume.
LEVEL
0–99
Sets the volume.
4. DEFRETTER
SENS
0–99
Sets the input sensitivity.
TONE
0–99
Sets the tonal brightness.
LEVEL
0–99
Sets the volume.
5. OCTAVE
-1 OCT LEVEL
0–99
Sets the volume of the sound that’s one
octave below.
-2 OCT LEVEL
0–99
Sets the volume of the sound that’s two
octaves below.
DIRECT LEVEL
0–99
Sets the volume of the direct sound.
6. HUMANIZER
SENS
0–99
Sets the input sensitivity.
VOWEL1
a, e, i, o, u
Selects the rst vowel.
VOWEL2
a, e, i, o, u
Selects the second vowel.
7. FEEDBACKER
-
No function is controlled.
DEPTH
0–99
Adjusts how readily the feedback is
applied.
-
No function is controlled.
8. AC SIM
LOW
0–99
Species the sense of volume for the low-
frequency range.
HIGH
0–99
Species the sense of volume for the
high-frequency range.
LEVEL
0–99
Sets the volume.
9. SOLO
LOW
0–99
Species the sense of volume for the low-
frequency range.
HIGH
0–99
Species the sense of volume for the
high-frequency range.
LEVEL
0–99
Sets the volume.
10. TUNE DOWN
PITCH
-12–0
Adjusts the pitch in semitones.
-
No function is controlled.
-
No function is controlled.
11. S-BEND
PITCH
-3–+4
Adjusts the pitch in octaves.
RISE TIME
0–99
This parameter adjusts the amount
of time it is to take for the eect to
transition to the maximum.
FALL TIME
0–99
This parameter adjusts the amount
of time it is to take for the eect to
transition to the original.
11. D-COMP
SUSTAIN
0–99
Sets how long the sound rings out
(sustains).
ATTACK
0–99
Sets the attack time of the sound.
LEVEL
0–99
Sets the volume.

4
Eects
Eect type
1 2 3
11. RING MOD
FREQ
0–99
Sets the frequency of the internal
oscillator.
DIRECT LEVEL
0–99
Sets the volume of the direct sound.
MOD LEVEL
0–99
Sets the volume of the modulated sound.
11. POLY OCTAVE
RANGE
0–99
This selects the register to which the
eect is applied.
-1 OCT LEVEL
0–99
Sets the volume of the sound that’s one
octave below.
DIRECT LEVEL
0–99
Sets the volume of the direct sound.
11. T.WAH DOWN
SENS
0–99
Sets the input sensitivity.
TONE
0–99
Sets the tone (brightness) of the wah
eect.
PEAK
0–99
Sets the strength (character) of the eect.
11. Single > Hum
LOW
0–99
Species the sense of volume for the low-
frequency range.
HIGH
0–99
Species the sense of volume for the
high-frequency range.
LEVEL
0–99
Sets the volume.
11. Hum > Single
LOW
0–99
Species the sense of volume for the low-
frequency range.
HIGH
0–99
Species the sense of volume for the
high-frequency range.
LEVEL
0–99
Sets the volume.

5
Eects
OD/DS (overdrive/distortion)
This eect gives distortion and sustain characteristics to the sound.
In manual mode or in memory edit mode, you can turn the eect on/o with the number [2]/[OD/DS] pedal.
Overdrive/distortion types
Eect type Indicator color Explanation
1. BOOST Yellow This is a booster with unique characteristics in the midrange. Use this along with an AIRD preamp to
create sounds that are great for playing solos.
2. OVERDRIVE Yellow The sound of the BOSS SD-1.
3. T-SCREAM Yellow This models an Ibanez TS-808.
4. CENTA OD Yellow This models a KLON CENTAUR.
5. BLUES OD Yellow The sound of the BOSS BD-2.
6. DISTORTION Orange The sound of the BOSS DS-1.
7. TURBO DS Orange Gives a characteristic distortion eect in the midrange band. This is the sound you hear when BOSS
DS-2 TURBO=ON.
8. RAT DS Orange This models a Proco RAT.
9. METAL DS Red The sound of the BOSS METAL ZONE MT-2.
10. CORE Red This is a BOSS ML-2 sound that’s optimal for playing high-speed heavy metal ris.
11. MUFF FUZZ Red This models an Electro Harmonics Big Mu π.
You can use the BOSS TONE STUDIO for ME-90 dedicated app to exchange the 11. MUFF FUZZ with the following eects.
Dierent settings can be made for each patch.
Eect type Indicator color Explanation
CLEAN BOOST Yellow This not only functions as a booster, but also produces a clean tone that has punch even when used
alone.
TREBLE BOOST Yellow This is a booster that has bright characteristics.
OD-1 Yellow The sound of the BOSS OD-1. This produces sweet, mild distortion.
TURBO OD Yellow A powerful overdrive sound. This is the sound you hear when BOSS OD-2 TURBO=ON.
GUV DS Orange This models a Marshall GUV‘NOR.
‘60S FUZZ Red This models a FUZZFACE.
OCT FUZZ Red The Octavia sound (a certain kind of fuzz with a mixed-in tone one octave higher).
Knob functions
1 2 3
Eect type
1 2 3
All OD/DS types
DRIVE
0–99
Sets the strength of the distortion.
TONE
0–99
Sets the tonal brightness.
LEVEL
0–99
Sets the OD/DS volume.

6
Eects
MOD (modulation)
Adds spaciousness or an undulating character to the sound.
In manual mode or in memory edit mode, you can turn the eect on/o with the number [3]/[MOD] pedal.
Modulation types
Eect type Indicator color Explanation
1. PHASER Green Adds an out-of-phase sound for a modulated, swelling eect.
2. FLANGER Purple Adds modulation that sounds like a jet airplane taking o and landing.
3. TREMOLO Green Gives a retro eect by cyclically changing the volume.
4. CHORUS Light blue Chorus is an eect that creates a beautiful spaciousness and depth by adding a slightly modulated
sound. The direct sound is set to a xed volume.
5. VIBRATO Light blue Gives a wild vibrato eect that can’t be created using standard guitar playing techniques.
6. PITCH SHIFT Light blue This eect changes the pitch of the original sound (up or down) within a range of two octaves.
7. HARMONIST Light blue Creates harmonies similar to playing twin guitar.
* Use single notes when playing with this eect. The direct sound is set to a xed volume.
8. ROTARY Light blue Produces a stereo eect like the sound of a rotary speaker.
9. UNI-V Light blue Models the Uni-Vibe sound that’s a must-have for 1960s rock.
10. DELAY White Delays the sound to create an echo-like eect. You can set the delay time between 10–800 ms
(milliseconds), for use as a second delay.
11. OVERTONE Light blue This eect uses MDP technology to add new harmonics to the sound, producing resonance and
richness that was not present in the original sound.
You can use the BOSS TONE STUDIO for ME-90 dedicated app to exchange the 11. OVERTONE with the following eects.
Dierent settings can be made for each patch.
Eect type Indicator color Explanation
SCRIPT PHASER Green This models the MXR Phase 90 which was manufactured during the‘70s.
STEREO CHORUS Light blue This is a two-phase stereo chorus eect that adds dierent chorus sounds to the L and R channels.
CE-1 CHORUS Light blue The chorus sound of the BOSS CE-1.
AUTO WAH Light blue This changes the ltering over a periodic cycle, providing an automatic wah eect.

7
Eects
Knob functions
1 2 3
Eect type
1 2 3
1. PHASER
RATE
0–99
Sets the rate of the modulation.
DEPTH
0–99
Sets the amount of modulation.
RESONANCE
0–99
Sets the strength (character) of the
eect.
2. FLANGER
RATE
0–99
Sets the speed of modulation.
DEPTH
0–99
Sets the amount of modulation.
RESONANCE
0–99
Sets the strength (character) of the
eect.
3. TREMOLO
RATE
0–99
Sets the speed of modulation.
DEPTH
0–99
Sets the amount of modulation.
E. LEVEL
0–99
Sets the volume of the eect sound.
4. CHORUS
RATE
0–99
Sets the speed of modulation.
DEPTH
0–99
Sets the amount of modulation.
E. LEVEL
0–99
Sets the volume of the eect sound.
5. VIBRATO
RATE
0–99
Sets the speed of modulation.
DEPTH
0–99
Sets the amount of modulation.
E. LEVEL
0–99
Sets the volume of the eect sound.
6. PITCH SHIFT
PITCH
-24–DETUNE–+24
Sets how much to shift the pitch, in
semitones. This gives a detuning eect
when “0” is shown on the display.
D. LEVEL
0–99
Sets the volume of the direct sound.
E. LEVEL
0–99
Sets the volume of the eect sound.
7. HARMONIST
KEY
C (Am)–B (G´m)
Sets the key of the song you’re playing.
*1
HARMONY
-8th–DETUNE–+8th
Sets the pitch of the harmony sound in
steps. This gives a detuning eect when
“0” is shown on the display. *2
E. LEVEL
Sets the volume of the eect sound.
8. ROTARY
RATE
0–99
Sets the speed of modulation.
DEPTH
0–99
Sets the amount of modulation.
E. LEVEL
0–99
Sets the volume of the eect sound.
9. UNI-V
RATE
0–99
Sets the speed of modulation.
DEPTH
0–99
Sets the amount of modulation.
E. LEVEL
0–99
Sets the volume of the eect sound.
10. DELAY
TIME
10–800
Sets the delay time (10–800 ms) in units
of 10 ms. *3
FEEDBACK
0–99
Sets how many times to repeat the delay.
E. LEVEL
0–99
Sets the volume of the eect sound.
11. OVERTONE
UPPER
0–99
Adjusts the volume of the harmonic one
octave above.
LOWER
0–99
Adjusts the volume of the harmonic one
octave below.
D. LEVEL
0–99
Sets the volume of the direct sound.
11. SCRIPT PHASER
RATE
0–99
Sets the rate of the modulation.
DEPTH
0–99
Sets the amount of modulation.
E. LEVEL
0–99
Sets the volume of the eect sound.

8
Eects
Eect type
1 2 3
11. STEREO CHORUS
RATE
0–99
Sets the speed of modulation.
DEPTH
0–99
Sets the amount of modulation.
E. LEVEL
0–99
Sets the volume of the eect sound.
11. CE-1 CHORUS
RATE
0–99
Sets the speed of modulation.
DEPTH
0–99
Sets the amount of modulation.
E. LEVEL
0–99
Sets the volume of the eect sound.
11. AUTO WAH
RATE
0–99
Sets the speed of modulation.
DEPTH
0–99
Sets the amount of modulation.
E. LEVEL
0–99
Sets the volume of the eect sound.
Major
Major
Minor
Minor
*1: Song keys and sheet music accidentals (´, ³)Examples of key indications
(E) (C´)
*2: Examples of harmony indications
-1 octave +1 octaveDetune Up a third
*3: Examples of delay time (TIME) indications
10 ms 790 ms

9
Eects
DELAY
Delays the sound to create an echo-like eect. Use this to add thickness or for tricky-sounding eects.
In manual mode or in memory edit mode, you can turn the eect on/o with the number [4]/[DELAY] pedal.
Delay types
Eect type Indicator color Explanation
1. STANDARD White Delays the sound to create an echo-like eect. The delay time can be set within a range of 10–800
ms (milliseconds).
2. ANALOG White Gives a mild analog delay sound.
3. TAPE White This setting provides the characteristic wavering sound of the tape echo.
4. WARM White A slightly vague, warm-sounding digital delay.
5. MODULATE White This delay adds a pleasant wavering eect to the sound.
6. REVERSE White Produces a reverse playback eect.
7. TEMPO White Use the pedal to set the delay time (tempo).
8. TERA ECHO White This eect uses MDP technology to create a unique ambience and a spaciousness that changes
according to your picking dynamics.
9. SHIMMER White Delay with pitch-shifted sound mixed in.
10. PHRASE LOOP White Lets you record your performance and play it back repeatedly. This is useful for both playing live and
when practicing.
11. +REVERB White A delay combined with reverb, which multiplies the eects to create rich reverberations.
You can use the BOSS TONE STUDIO for ME-90 dedicated app to exchange the 11. +REVERB with the following eects.
Dierent settings can be made for each patch.
Eect type Indicator color Explanation
CHO+DELAY White A delay combined with chorus.
WARP White Produces a dream-like sound. The eect is applied while you hold down the pedal.
TWIST White Produces an aggressive sense of rotation. Using this in conjunction with distortion produces an even
wilder sense of rotation. The eect is applied while you hold down the pedal.
GLITCH White Creates a machine gun-like delay eect. The eect is applied while you hold down the pedal.

10
Eects
Knob functions
1 2 3
Eect type
1 2 3
1. STANDARD
TIME
10–800
Sets the delay time (10–800 ms) in units
of 10 ms. *1
FEEDBACK
0–99
Sets how many times to repeat the delay.
E. LEVEL
0–99
Sets the volume of the eect sound.
2. ANALOG
TIME
10–800
Sets the delay time (10–800 ms) in units
of 10 ms. *1
FEEDBACK
0–99
Sets how many times to repeat the delay.
E. LEVEL
0–99
Sets the volume of the eect sound.
3. TAPE
TIME
10–800
Sets the delay time (10–800 ms) in units
of 10 ms. *1
FEEDBACK
0–99
Sets how many times to repeat the delay.
E. LEVEL
0–99
Sets the volume of the eect sound.
4. WARM
TIME
10–800
Sets the delay time (10–800 ms) in units
of 10 ms. *1
FEEDBACK
0–99
Sets how many times to repeat the delay.
E. LEVEL
0–99
Sets the volume of the eect sound.
5. MODULATE
TIME
10–800
Sets the delay time (10–800 ms) in units
of 10 ms. *1
FEEDBACK
0–99
Sets how many times to repeat the delay.
E. LEVEL
0–99
Sets the volume of the eect sound.
6. REVERSE
TIME
10–800
Sets the delay time (10–800 ms) in units
of 10 ms. *1
FEEDBACK
0–99
Sets how many times to repeat the delay.
BALANCE
0–99
Adjusts the volume balance between
the eect sound and the direct sound. A
setting of “99” mutes the direct sound.
7. TEMPO
Ň, ņ
Sets the beat of the delay. *2
FEEDBACK
0–99
Sets how many times to repeat the delay.
E. LEVEL
0–99
Sets the volume of the eect sound.
8. TERA ECHO
TIME
0–99
Adjusts the length of the eect sound.
FEEDBACK
0–99
Adjusts the decay of the eect sound.
E. LEVEL
0–99
Sets the volume of the eect sound.
9. SHIMMER
TIME
10–800
Sets the delay time (10–800 ms) in units
of 10 ms. *1
FEEDBACK
0–99
Adjusts the decay of the eect sound.
E. LEVEL
0–99
Sets the volume of the eect sound.
10. PHRASE LOOP
-
No function is controlled.
-
No function is controlled.
LEVEL
0–99
Sets the volume of the phrase loop.
11. +REVERB
TIME
10–800
Sets the delay time (10–800 ms) in units
of 10 ms. *1
FEEDBACK
0–99
Adjusts the decay of the eect sound.
E. LEVEL
0–99
Sets the volume of the eect sound.
11. CHO+DELAY
TIME
10–800
Sets the delay time (10–800 ms) in units
of 10 ms. *1
FEEDBACK
0–99
Adjusts the decay of the eect sound.
E. LEVEL
0–99
Sets the volume of the eect sound.

11
Eects
Eect type
1 2 3
11. WARP
TIME
10–800
Sets the delay time (10–800 ms) in units
of 10 ms. *1
-
No function is controlled.
E. LEVEL
0–99
Sets the volume of the eect sound.
11. TWIST
RISE TIME
0–99
This parameter adjusts the amount
of time it is to take for the eect to
transition to the maximum.
FALL TIME
0–99
Adjusts how much time it takes for the
rotary eect to stop.
E. LEVEL
0–99
Sets the volume of the eect sound.
11. GLITCH
TIME
0–99
Adjusts the length of the eect sound.
GLITCH
0–99
Adjusts the intensity of the eect.
BALANCE
0–99
Adjusts the volume balance between the
direct sound and eect sound. A setting
of “99” mutes the direct sound.
*1: Examples of delay time (TIME) indications
10 ms 790 ms
*2: Examples of beat (Ň, ņ) indications
Dotted eighth note Quarter note

12
Eects
PREAMP
This models the characteristics of a preamp.
In manual mode or in memory edit mode, you can turn the eect on/o with the number [BANK É]/[AMP] pedal.
Preamp type
Preamp type Indicator color Explanation
1. NATURAL Green An unembellished, clean sound that minimizes the amp’s idiosyncrasies, such as its trebly character
and boomy low end.
2. X-CRUNCH Orange Crunch sound that uses MDP to deliver a crisp tone from all strings.
3. X-HI GAIN Orange High-gain sound that uses MDP to obtain high-gain sound with a wide range and a great-feeling
sense of separation.
4. MAXIMUM Orange An amp that delivers the distinctively great response and tone of a vintage Marshall, while making it
even higher gain.
5 JUGGERNAUT Red A large stack sound that has been tweaked extensively in the pursuit of the ultimate metal sound.
6. X-MODDED Red Core sound that uses MDP to preserve the denition of the sound even with extreme gain.
7. TWIN COMBO Green This models a Fender Twin Reverb.
8. TWEED COMBO Orange This models a Fender Bassman 4x10” Combo.
9. DIAMOND Orange This models a VOX AC30.
10. BRIT STACK Orange This models a Marshall 1959.
11. RECTI STACK Red This models the sound of the Channel 2 MODERN Mode on the MESA/Boogie DUAL Rectier.
You can use the BOSS TONE STUDIO for ME-90 dedicated app to exchange the 11. RECTI STACK with the following preamps.
Dierent settings can be made for each patch.
Eect type Indicator color Explanation
TRANSPARENT Green An amp with a broad frequency range and an extremely at response. Good for acoustic guitar.
BOUTIQUE Orange Crunch sound that allows the nuances of your picking to be expressed even more faithfully than on
conventional combo amps.
SUPREME Orange Great-feeling crunch sound that responds to the nuances of your picking while taking advantage of
the distinctive character of a 4x12” speaker cabinet.
JC-120 Green This models the sound of the Roland JC-120.
DELUXE COMBO Orange This models a Fender Deluxe Reverb.

13
Eects
Knob functions
1 2 3 4 5
Eect type
1 2 3 4 5
All PREAMP types
GAIN
0–99
Adjusts the amount
of distortion in the
preamp.
BASS
0–99
Adjusts the sound level
of the low-frequency
range.
MIDDLE
0–99
Adjusts the sound
level of the middle-
frequency range.
TREBLE
0–99
Adjusts the sound level
of the high-frequency
range.
LEVEL
0–99
Adjusts the volume of
the entire preamp.
NS (noise suppressor)
Reduces the noise and hum picked up by guitar pickups.
1. Press the [BANKÉ] [BANKÇ] pedals while holding down the [EDIT] button to adjust the threshold.
Setting range Explanation
0–50
Adjust this parameter as appropriate for the volume of the noise. If the noise level is high, a higher setting is appropriate. If the
noise level is low, a lower setting is appropriate. When this is set to “0”, the noise suppressor is turned o.
* If the setting is higher than necessary, no sound may be heard if the volume of the guitar sound is low.

14
Eects
EQ/FX2 (equalizer/eect 2)
This adjusts the tone. You can also select from a variety of unique eects.
In manual mode or in memory edit mode, you can turn the eect on/o with the number [BANK Ç]/[EQ] pedal.
Eect type
You can use the [MODE] knob to change how the eects work.
Eect type Indicator color Mode Explanation
1. PHASER Green 1: NORMAL Adds an out-of-phase sound for a modulated, swelling eect.
2: SCRIPT This models the MXR Phase 90 which was manufactured during the ‘70s.
2. TREM/PAN Green
1: TREMOLO Gives a retro eect by cyclically changing the volume.
2: PAN
With the volume level of the left and right sides alternately changing, when
playing sound in stereo, you can get an eect that makes the guitar sound
appear to y back and forth between the speakers.
3. BOOST Yellow
1: MID This is a booster with unique characteristics in the midrange. Use this along with
a preamp to create sounds that are great for playing solos.
2: CLEAN This not only functions as a booster, but also produces a clean tone that has
punch even when used alone.
3: TREBLE This is a booster that has bright characteristics.
4. DELAY White
1: STANDARD Delays the sound to create an echo-like eect.
2: ANALOG Gives a mild analog delay sound.
3: TAPE This setting provides the characteristic wavering sound of the tape echo.
5. CHORUS Light blue
1: MONO Chorus is an eect that creates a beautiful spaciousness and depth by adding a
slightly modulated sound.
2: STEREO This is a two-phase stereo chorus eect that adds dierent chorus sounds to the
L and R channels.
3: CE-1 The chorus sound of the BOSS CE-1.
6. EQ Green - This is a three-band equalizer.
You can use the BOSS TONE STUDIO for ME-90 dedicated app to exchange the 6. EQ with the following eects.
Dierent settings can be made for each patch.
Eect type Indicator color Explanation
FLANGER Purple Adds modulation that sounds like a jet airplane taking o and landing.
VIBRATO Light blue Gives a wild vibrato eect that can’t be created using standard guitar playing techniques.
PITCH SHIFT Light blue This eect changes the pitch of the original sound (up or down) within a range of two octaves.
HARMONIST Light blue Creates harmonies similar to playing twin guitar.
* Use single notes when playing with this eect. The direct sound is set to a xed volume.
ROTARY Light blue Produces a stereo eect like the sound of a rotary speaker.
UNI-V Light blue Models the Uni-Vibe sound that’s a must-have for 1960s rock.
OVERTONE Light blue This eect uses MDP technology to add new harmonics to the sound, producing resonance and
richness that was not present in the original sound.

15
Eects
Knob functions
1 2 3 4
Eect type
1 2 3 4
1. PHASER
MODE
1: NORMAL
2: SCRIPT
Selects the eect type.
RATE
0–99
Sets the rate of the
modulation.
DEPTH
0–99
Sets the amount of
modulation.
RESONANCE
0–99
Sets the strength (character)
of the eect with the MODE 1:
NORMAL setting.
E. LEVEL
0–99
Sets the volume of the eect
sound with the MODE 2:
SCRIPT setting.
2. TREM/PAN
MODE
1: TREMOLO
2: PAN
Selects the eect type.
RATE
0–99
Sets the speed of modulation.
DEPTH
0–99
Sets the amount of
modulation.
E. LEVEL
0–99
Sets the volume of the eect
sound.
3. BOOST
MODE
1: MID
2: CLEAN
3: TREBLE
Selects the eect type.
DRIVE
0–99
Sets the strength of the
distortion.
TONE
0–99
Sets the tonal brightness.
LEVEL
0–99
Sets the volume.
4. DELAY
MODE
1: STANDARD
2: ANALOG
3: TAPE
Selects the eect type.
TIME
10–800
Sets the delay time (10–800
ms) in units of 10 ms. *1
FEEDBACK
0–99
Sets how many times to
repeat the delay.
E. LEVEL
0–99
Sets the volume of the eect
sound.
5. CHORUS
MODE
1: MONO
2: STEREO
3: CE-1
Selects the eect type.
RATE
0–99
Sets the speed of modulation.
DEPTH
0–99
Sets the amount of
modulation.
E. LEVEL
0–99
Sets the volume of the eect
sound.
6. EQ
BASS
0–99
Adjusts the sound level of the
low-frequency range.
MIDDLE
0–99
Adjusts the sound level of the
middle-frequency range.
TREBLE
0–99
Adjusts the sound level of the
high-frequency range.
LEVEL
0–99
Sets the volume.
6. FLANGER
-
No function is controlled.
RATE
0–99
Sets the speed of modulation.
DEPTH
0–99
Sets the amount of
modulation.
RESONANCE
0–99
Sets the strength (character)
of the eect.
6. VIBRATO
-
No function is controlled.
RATE
0–99
Sets the speed of modulation.
DEPTH
0–99
Sets the amount of
modulation.
E. LEVEL
0–99
Sets the volume of the eect
sound.
6. PITCH SHIFT
-
No function is controlled.
PITCH
-24–DETUNE–+24
Sets how much to shift the
pitch, in semitones. This gives
a detuning eect when “0” is
shown on the display.
D. LEVEL
0–99
Sets the volume of the direct
sound.
E. LEVEL
0–99
Sets the volume of the eect
sound.

16
Eects
Eect type
1 2 3 4
6. HARMONIST
-
No function is controlled.
KEY
C (Am)–B (G´m)
Sets the key of the song you’re
playing. *2
HARMONY
-8th–DETUNE–+8th
Sets the pitch of the harmony
sound in steps. This gives a
detuning eect when “0” is
shown on the display. *3
E. LEVEL
Sets the volume of the eect
sound.
6. ROTARY
-
No function is controlled.
RATE
0–99
Sets the speed of modulation.
DEPTH
0–99
Sets the amount of
modulation.
E. LEVEL
0–99
Sets the volume of the eect
sound.
6. UNI-V
-
No function is controlled.
RATE
0–99
Sets the speed of modulation.
DEPTH
0–99
Sets the amount of
modulation.
E. LEVEL
0–99
Sets the volume of the eect
sound.
6. OVERTONE
-
No function is controlled.
UPPER
0–99
Adjusts the volume of the
harmonic one octave above.
LOWER
0–99
Adjusts the volume of the
harmonic one octave below.
D. LEVEL
0–99
Sets the volume of the direct
sound.
*1: Examples of delay time (TIME) indications
10 ms 790 ms
Major
Major
Minor
Minor
*2: Song keys and sheet music accidentals (´, ³)Examples of key indications
(E) (C´)
*3: Examples of harmony indications
-1 octave +1 octaveDetune Up a third

17
Eects
REVERB
This adds a stereo reverberation to the sound.
In manual mode or in memory edit mode, you can turn the eect on/o with the number [CTL]/[REV] pedal.
Reverb type
Reverb type Indicator color Explanation Example indications
ROOM Blue-green Simulates indoor reverberations. (Value: E. LEVEL 0–49) –
HALL Blue-green Simulates hall reverberations. (Value: E. LEVEL 0–49) –
SPRING Blue-green A reverb that models a spring reverb.
(Value: E. LEVEL 0–49) –
* When this is set to “0”, reverb is turned o.

18
Eects
PEDAL FX (pedal eects)
Lets you achieve various eects using the expression pedal on this unit.
You can turn the pedal eect on/o by pushing the expression pedal up with your weight on your toes.
When the pedal eect is o, the expression pedal works as a volume pedal.
Pedal eect types
Eect type Indicator color Explanation
1. WAH Pink A wah eect.
2. VOICE Pink Creates an eect like the sound of a human voice.
3. +1 OCT Pink Lets you continuously change the pitch respective to the original, over a range of +1 octave.
* Use single notes when playing with this eect.
4 +2 OCT Pink Lets you continuously change the pitch respective to the original, over a range of +2 octaves.
* Use single notes when playing with this eect.
5. -1 OCT Pink Lets you continuously change the pitch respective to the original, over a range of -1 octave.
* Use single notes when playing with this eect.
6. -2 OCT Pink Lets you continuously change the pitch respective to the original, over a range of -2 octaves.
* Use single notes when playing with this eect.
7. FREEZE Pink When you press the pedal, the freeze function turns on, which makes the guitar sound sustain. The
freeze function is applied right when you press the pedal.
8. OSC DELAY Pink An eect that uses FEEDBACK and TIME to generate DELAY oscillation, which you can control with
just the pedal.
9. OD/DS Orange
Lets you control the DRIVE parameter when using OD/DS eects.
* The maximum value you can control with the expression pedal is the value you set using the
[DRIVE] knob.
10. MOD RATE Light blue
Lets you control the RATE parameter when using MOD eects.
* The maximum value you can control with the expression pedal is the value you set using the
[RATE] knob.
11. DELAY LEVEL White
Lets you control the delay level when using DELAY eects.
* The maximum value that you can control with the expression pedal is the value you set using
the [E. LEVEL] knob.
* When you operate the expression pedal, please be careful not to get your ngers pinched between the movable part and the unit. In places
where small children are present, make sure that an adult provides supervision and guidance.

19
System
Conguring the system settings
1. Press the [MEMORY/MANUAL] pedal to switch to manual mode.
2. Press the [EDIT] button to select the parameter to set.
The parameter to set changes each time you press the [EDIT] button.
3. Use the [BANK É] [BANK Ç] pedals to select a value.
4. Press the [WRITE] button.
The settings are saved.
Parameter Display Explanation
OUTPUT SELECT
Species the amp that’s connected to the OUTPUT jacks.
1TUBE COMBO 212
INPUT
Use this setting when connecting to the INPUT jack of a vacuum tube combo amp (in which
the amp and speakers are in a single unit) equipped with two 12-inch speakers.
2TUBE COMBO 212
RETURN
Use this setting when connecting to the RETURN jack of a vacuum tube combo amp (in
which the amp and speakers are in a single unit) equipped with two 12-inch speakers.
3TUBE COMBO 112
INPUT
Use this setting when connecting to the INPUT jack of a vacuum tube combo amp (in which
the amp and speakers are in a single unit) equipped with one 12-inch speaker.
4TUBE COMBO 112
RETURN
Use this setting when connecting to the RETURN jack of a vacuum tube combo amp (in
which the amp and speakers are in a single unit) equipped with one 12-inch speaker.
5TUBE STACK 412
INPUT
Use the setting when connecting to the INPUT jack of a vacuum tube guitar amp stack (in
which the amp and speaker are separate units).
This assumes that the connected speaker cabinet is equipped with four 12-inch speakers.
6TUBE STACK 412
RETURN
Use the setting when connecting to the RETURN jack of a vacuum tube guitar amp stack (in
which the amp and speaker are separate units).
This assumes that the connected speaker cabinet is equipped with four 12-inch speakers.
7JC-120 INPUT Use this setting when connecting to the guitar INPUT jack of a Roland JC-120 guitar amp.
8JC-120 RETURN Use this setting when connecting to the RETURN jack of a Roland JC-120 guitar amp.
9KATANA-100/212
INPUT Use this setting when connecting to the INPUT jack of a BOSS KATANA-100/212 guitar amp.
10 KATANA-100/212
RETURN
Use this setting when connecting to the RETURN jack of a BOSS KATANA-100/212 guitar
amp.
11 KATANA-100 INPUT Use this setting when connecting to the INPUT jack of a BOSS KATANA-100 guitar amp.
12 KATANA-100 RETURN Use this setting when connecting to the RETURN jack of a BOSS KATANA-100 guitar amp.
Knob motion
n0 The parameter value changes instantly when you operate the knobs (factory setting).
n1 The value only changes once the knob position reaches the parameter’s current value.
USB LEVEL L0–L9 Adjusts the level of audio input from your computer, which is mixed with the sound that passes through the ME-90’s
eects.
USB DIRECT
MONITOR
* Power-on setting
is d1
d0 The sound of the ME-90 is not output to the PHONES jack and the OUTPUT jacks.
d1 The sound of the ME-90 is output to the PHONES jack and the OUTPUT jacks.
USB LOOPBACK
b0 The input audio from the computer is not output via USB OUTPUT.
b1 The input audio from the computer is output via USB OUTPUT.
MIDI channels c1–c9,
c.0–c.6 ch 1–ch 9, ch 10–ch 16
Output settings
when using the
tuner
t0 No audio is output when you’re using the tuner.
t1 The direct sound is output while you’re using the tuner.

20
System
Parameter Display Explanation
Bank switch
operation
H0
Pressing the bank pedal to switch banks only changes the bank shown in the display, without actually switching to
a dierent patch. Both the bank and number are conrmed right when you press a numbered pedal, and the unit
switches to the next patch. (factory setting)
H1 The patch switches instantly when a bank pedal or numbered pedal is pressed.
Switching to manual
mode
m0 When you switch from memory mode to manual mode, the current knob settings are applied to the sound.
m1 When you switch from memory mode to manual mode, the memory settings are carried over (factory setting).
SEND/RETURN
insertion point
setting
S0 SEND/RETURN are inserted before the preamp in the signal chain. This is the optimal setting when using a distortion
pedal or the like (factory setting).
S1 SEND/RETURN are inserted after the preamp in the signal chain. This is the optimal setting when using a delay pedal
or the like.
Preserving/muting
the tail of an eect
when switching
between patches or
turning eects o
o0 When you switch patches, the eect’s delay sound you selected in DELAY is not carried over. This does not apply to
the DELAY for EQ/FX2 and MOD.
o1 When you switch patches, the eect’s delay sound you selected in DELAY is carried over (factory setting). This does
not apply to the DELAY for EQ/FX2 and MOD.
LED illumination
color
E0 The LEDs can light up in one of ten colors (factory setting).
E1
The LEDs only light up to indicate their state in white and in color changes that are easy to distinguish (only red,
yellow and blue).
This mode is recommended for users with diculties distinguishing colors or who have related visual impairments, or
for users who prefer a classic-looking display.
REV footswitch
functions
r0 In manual mode, this turns the reverb on/o (factory setting).
r1 In manual mode, this turns SEND/RETURN on/o.