Tubbutec Juno-66 User manual

Tubbutec JUNO-66
Midi retrofit and feature extension for Roland Juno-6 and
Juno-60
User Manual for firmware version v1.1
http://tubbutec.de
1

Contents
1 Juno-66 5
1.1 Versions ............................. 5
2 Juno-66 switches and buttons 6
3 Play Modes 7
3.1 Play Modes Overview . . . . . . . . . . . . . . . . . . . . . . 7
3.2 Poly ............................... 7
3.3 Duo ............................... 8
3.4 Threevoice ........................... 8
3.5 MonoAandB ......................... 8
3.5.1 Auto portamento in Mono B . . . . . . . . . . . . . . 9
3.6 Chord .............................. 9
3.6.1 SaveaChord ...................... 9
3.7 Polychord ............................ 9
3.7.1 Recording a new Chord . . . . . . . . . . . . . . . . 9
3.8 Changing the play mode when arp is on . . . . . . . . . . . 10
3.9 New- and Old-school chord memory modes . . . . . . . . . . 10
4 Portamento 10
4.1 Select portamento speeds . . . . . . . . . . . . . . . . . . . . 10
4.2 Portamento and play modes . . . . . . . . . . . . . . . . . . 11
4.3 Constant Time and Constant Speed . . . . . . . . . . . . . . 11
5 Powerarp 12
5.1 Powerarp overview . . . . . . . . . . . . . . . . . . . . . . . 12
5.2 Creating a new sequence . . . . . . . . . . . . . . . . . . . . 12
5.3 playing and transposing . . . . . . . . . . . . . . . . . . . . 12
5.4 ModeandRange ........................ 13
5.4.1 Mode........................... 13
5.4.2 Range .......................... 13
2

CONTENTS 3
5.5 Playing a previously saved sequence . . . . . . . . . . . . . . 13
6 Custom tuning, scales and detuning 14
7 Midi 14
7.1 Midiin.............................. 14
7.2 Midiout............................. 14
7.2.1 Midi out as played . . . . . . . . . . . . . . . . . . . 14
7.2.2 Midi out as sounds . . . . . . . . . . . . . . . . . . . 15
7.3 Arpeggiator and Sample and Hold Trigger . . . . . . . . . . 15
7.4 Filterovermidi ......................... 15
7.5 Programchange......................... 16
7.6 PitchBend ........................... 16
8 Additional filter ADSR 16
9 Triangular filter LFO 17
10 S/H filter LFO 17
11 Config menu 18
11.1 Enter and exit the config menu . . . . . . . . . . . . . . . . 18
11.2 Configure Midi Channels . . . . . . . . . . . . . . . . . . . . 18
11.3 Portamento settings . . . . . . . . . . . . . . . . . . . . . . . 18
11.4 Detuning, Scales and Fatness . . . . . . . . . . . . . . . . . 19
11.5 Configure arp trigger . . . . . . . . . . . . . . . . . . . . . . 19
11.6 Configure S/H trigger . . . . . . . . . . . . . . . . . . . . . . 19
11.7S/HLFOamount........................ 19
11.8 Duo and Three voice . . . . . . . . . . . . . . . . . . . . . . 19
11.9 New-school and Old-school chord memory modes . . . . . . 20
11.10Auto portamento . . . . . . . . . . . . . . . . . . . . . . . . 20
11.11Pitch bend calibration . . . . . . . . . . . . . . . . . . . . . 20
11.12Factoryreset .......................... 20
12 Tips and tricks 20
12.1 Transferring a melody to Powerarp . . . . . . . . . . . . . . 20
12.2 Use of Powerap transpose and Polychord . . . . . . . . . . . 21
12.3 Copy a Polychord . . . . . . . . . . . . . . . . . . . . . . . . 21
13 Appendix 22
13.1 Midi controller chart . . . . . . . . . . . . . . . . . . . . . . 22
13.2 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . 23

4CONTENTS
13.2.1 Midi in not working . . . . . . . . . . . . . . . . . . . 23
13.2.2 Midi loop back problems . . . . . . . . . . . . . . . . 23
13.2.3 Midi filter control and S/H LFO not working . . . . . 23
13.3Thanks.............................. 23

5
1 Juno-66
The Juno-66 is a midi retrofit and feature extension for the Roland Juno-6
and Juno-60 synthesizers. It features various additional play modes, a freely
definable arpeggiator / sequencer, midi in and midi out,two chord memory
modes, two additional filter LFOs and plenty other features.
This manual only describes the features different from the Juno-6 / 60.
Great care has been taken to not alter the original behaviour of the synths
with an exception of the key transpose function.
1.1 Versions
New features in version 1.1:
•Three voice mode optionally replaces Duophonic mode
•Additional ADSR envelope for filter
•Optional auto portamento mode for ’Mono B’
•Adjustable divider for internal arp clock and external trigger
•Select between old- and new-school chord memory

62. JUNO-66 SWITCHES AND BUTTONS
2 Juno-66 switches and buttons
The Juno-66 functions are controlled by the following switches and buttons
on the left side of the synth’s panel:
KEY TRANSPOSE, HOLD, ARP ON/OFF, ARP MODE and ARP range.
The original function of the KEY TRANSPOSE button is replaced and it
now serves as a ’FUNCTION TRANSPOSE’ button, allowing the control
of many additional functions. When the arpeggiator is switched off, the arp
button and switches double as switches to set the play mode, portamento,
and control the Powerarp sequencer. A sticker showing the most important
additional features come with the kit.
KEY
TRANSPOSE HOLD
ON/OFF MODE RANGE RATE
ARPEGGIO
UP
DOWN
1
2
3
UP
&
DOWN
PORTA
Poly
Mono A
Chord
UP
U/D
D
Off
Fast
Slow
1
2
3
Duo
Mono B
Polychord
MODE
Record
Chord
Power-
arp
+
+ARP
tubbutec
Figure 1: Juno-66 controls

7
3 Play Modes
3.1 Play Modes Overview
In addition to the 6 voice polyphonic mode five new play modes are intro-
duced with the Juno-66:
Two monophonic modes, a duophonic mode, chord memory and Polychord.
When the arpeggiator is turned off, use the MODE switch and the KEY
TRANSPOSE button to select the play mode. If the KEY TRANSPOSE
led is off you can select the left column of modes (Poly, Mono A and Chord),
by pressing the KEY TRANSPOSE button, the led turnes on and the sec-
ond column (Duo, Mono B and Polychord) is selected. When the arpeggia-
tor is turned on the play modes can still be selected, see below.
PORTA
Poly
Mono A
Chord
UP
U/D
D
Off
Fast
Slow
1
2
3
Duo
Mono B
Polychord
MODE
Record
Chord
Power-
arp
+
+ARP
tubbutec
Figure 2: Play mode selection overview
3.2 Poly
Poly mode is the normal 6 voice polyphonic mode also used in the original
synths. The voices are assigned in a rotary algorithm and voice stealing is
performed on the ’oldest’ voice.

83. PLAY MODES
3.3 Duo
The duophonic layers three oscillators per voice and detunes the voices to
create a thicker, denser sound similar to the ’supersaw’ or ’supersquare’
modes often found in synthesizers. The fatness can be controlled by midi
7 or in the config menu 11. By adjusting the fatness a wide range of sonds
from ’clean’ over ’fat’ to ’dirty’ and finally ’detuned’ can be achieved. Voice
stealing is performed so that only the second played voice is replaced, the
first stays until released.
Use the config menu to select between Duo and Three-voice modes.
3.4 Three voice
The three voice mode optionally replaces the Duo mode. Use the config
menu to select which of the two are used when setting the panel switch to
Duo.
Three voice mode layers two oscillators per voice and detunes the voices
to create a thicker, denser sound similar to the ’supersaw’ or ’supersquare’
modes often found in synthesizers. The fatness can be controlled by midi
7 or in the config menu 11. By adjusting the fatness a wide range of sonds
from ’clean’ over ’fat’ to ’dirty’ and finally ’detuned’ can be achieved.
3.5 Mono A and B
In the monophic modes all six Oscillators are layered and detuned with
respect to each other to achive a thicker, denser sound similar to the ’su-
persaw’ or ’supersquare’ modes often found in synthesizers. The fatness can
be controlled by midi 7 or in the config menu 11. By adjusting the fatness
a wide range of sonds from ’clean’ over ’fat’ to ’dirty’ and finally ’detuned’
can be achieved.
The monophonic mode assignes the notes in a ’last played’ fashion: Press a
key and it will be played. When releasing a key and keys are still pressed,
the last played note is played. The algorithm memorizes the last eight
played keys to create an intuitive feeling.
In Mono mode A the envelope is retriggered each time a note is played,
Mode B does not retrigger the envelope when playing legato.

3.6. CHORD 9
3.5.1 Auto portamento in Mono B
If auto portamento is activated in the config menu, in Mono B mode por-
tamento will only be active when playing legato. Otherwise there will be
no glide.
3.6 Chord
The chord memory mode allows you to memorize a chord consisting of up
to six notes and transpose it with the keyboard.
3.6.1 Save a Chord
To save a new chord first play it on the keyboard and either hold down the
keys, press the HOLD button or use a sustain pedal to hold it. You can
play the chord in any of the play modes including Polychord mode. Now
while the notes are still on hold down the KEY TRANSPOSE button until
it starts blinking. By pressing it again the chord is now saved and used in
chord mode.
3.7 Polychord
The Polychord functionality allows you to assign an individual chord to
each key of the keyboard and play these chords with a single key press.
Like any other play mode Polychord can be used in conjunction with the
Powerarp. Combining the two gives you a versatile chord sequencer!
3.7.1 Recording a new Chord
To save a new chord first play it on the keyboard and either hold down
the keys, press the HOLD button or use a sustain pedal to hold it. You
can play the chord in any of the play modes including Polychord mode.
Now while the notes are still on hold down the KEY TRANSPOSE button
until it starts blinking. You can now release the pressed keys. The blinking
indicates the synth is waiting for the location you want to save the chord
to. Press one of the keyboards keys, the chord will be saved at this location
and the blinking stops. The last saved chord is also used in chord memory
mode. The chords are saved even if you turn of the synthesizer.

10 4. PORTAMENTO
3.8 Changing the play mode when arp is on
It is possible to change the play mode even when the arpeggiator is turned
on. By pressing the KEY TRANSPOSE button, the play mode selected
with the mode switch is selected and used from here on until you press the
KEY TRANSPOSE button again or exit the arp.
3.9 New- and Old-school chord memory modes
Use the config menu to select between new and old school chord memory
and polychord modes. In old school mode when pressing a key the new
chord replaces the old one similar to a monophonic synthesizer with layered
oscillators. In new-school mode the new chord is added to the old one,
replacing voices when necessary.
4 Portamento
The Juno-66 features portamento for all play modes.
The portamento used in the Juno-66 is linear on the musical scale. This
means that when sliding from e.g. C to E, the time spent between C and
D is the same than between D and E.
4.1 Select portamento speeds
You can use the RANGE (PORTA) switch when the arpeggiator is turned
off to switch on portamento and select its speed. When the range switch is
set to 1, portamento is turned off. Setting it to 2 enables fast portamento,
3 slow portamento. The exact times for ’Slow’ and ’Fast’ can be set using
midi 7 or the config menu 11. You can use a midi controller to change the
portamento speed/time instantly.

4.2. PORTAMENTO AND PLAY MODES 11
PORTA
Poly
Mono A
Chord
UP
U/D
D
Off
Fast
Slow
1
2
3
Duo
Mono B
Polychord
MODE
Record
Chord
Power-
arp
+
+ARP
tubbutec
Figure 3: Portamento speed selection
4.2 Portamento and play modes
Portamento works in all play modes.
In Poly, Mono and Duo mode the last played note is used as the start for the
slide. In Chord mode all the voices slide in paralel and the structure of the
cord is preserved. In Polychord mode the structure is preserved if the two
chords are transpositions of each other (e.g. two minor chords. Otherwise
an extra algorithm makes sure that the lowest note of the first chord slides
to the lowest of the second chord and so on. This is to make sure that even
here a portamento sounds natural and you do not end up with musically
unpleasant sounds while sliding.
4.3 Constant Time and Constant Speed
The Juno-66 features two portamento modes: ’Constant Time’ and ’Con-
stant Speed’.
In ’Constant time’ mode it always takes the same amount of time to slide
from one note to the next no matter how far they are apart.
In ’Constant speed’ mode it takes a certain amount of time to slide from
one semitone to the next, the overall time for the slide changes with the
distance of the notes played. The modes can be selected in the config menu

12 5. POWERARP
11, ’Constant time’ is set as default.
5 Powerarp
5.1 Powerarp overview
The Powerarp mode lets you define a custom arpeggiator sequence which -
just like the normal arp - works in all play modes. You can define a sequence
of up to 128 notes, transpose in pitch or shift it in time. The next note is
triggered by the arp clock, midi clock via an adjustable divider or a midi
note.
5.2 Creating a new sequence
While holding down KEY TRANSPOSE switch on the arp with the arp
ON/OFF switch. The KEY TRANSPOSE led will start blinking. you
can now enter your sequence note by note. Pressing the HOLD key while
holding down a key will insert a tie and make the note longer by one step.
Pressing HOLD without holding down a key will insert a break with the
duration of one note. Note that you eigther have to only slightly press
the HOLD key so it does not latch, press it a second time to switch it off
again or use an external hold foot pedal. You can use this to program more
complex rhythms, then a usual arpeggiator can provide. When finished
press theKEY TRANSPOSE button again to save the sequence and get
into Powerarp mode. The sequence will be saved, even if you switch off the
Juno. .
5.3 playing and transposing
To play the sequence press the middle C (C3). To transpose the sequence
press key above or below the middle C. By activating HOLD or using a
HOLD pedal the seqence stays on even when no key is pressed. The two
uppermost keys of the keyboard have a special function. The C will advance
the sequence by one step, the B will move it back by one step. You can use

5.4. MODE AND RANGE 13
this to adjust the sequence to an external trigger without having to restart
or for more experimental purposes.
5.4 Mode and Range
5.4.1 Mode
The mode switch defines weather the arpeggio is played upwards, down-
wards or both alternating. There is a fourth Random Mode that can be
selected by the Range switch (see below)
5.4.2 Range
Set the range switch to 1 or 2 to play the sequence over a range of one or
two octaves. In two octave mode notes that would extend the range of the
keyboard are being folded back into the keyboards range.
Set the range switch to 3 to enter random mode. In this mode you can use
the mode switch to select different random modes as follows:
UP: Normal random mode
DOWN: Non repeating random mode (two consecutive notes will never be
the same)
UP & DOWN: Forward/Backward random (the sequence will randomly
advance or go back one step)
5.5 Playing a previously saved sequence
To switch directly into Powerarp hold the KEY TRANSPOSE button,
switch on the arp using the arp ON/OFF switch (same as recording a
sequence). Now without recording a sequence press the KEY transpose
button again. The Juno-66 is now in Powerarp mode with the previously

14 7. MIDI
used sequence.
6 Custom tuning, scales and detuning
...more about this later...
7 Midi
7.1 Midi in
Depending on the setting in the see config menu the Juno-66 receives midi
on channel 1-16 or an all channels (omni).
It reacts to midi notes 36 - 97
7.2 Midi out
The Juno-66 has two separate midi out modes and sends both on two differ-
ent midi channels simultaneously. You can configure the channel numbers
in the config menu or turn the channels off.
Midi notes 36 - 97 are being sent.
7.2.1 Midi out as played
On the as-played channel only the key presses on the Juno keyboard are
sent. If you record this channel and send it back to the Juno-66, the synth
will sound exactly the same as when you played it.

7.3. ARPEGGIATOR AND SAMPLE AND HOLD TRIGGER 15
This is useful for using the Juno as a midi keyboard. In this mode sustain
pedal events will be sent as ”sustain” midi messages.
7.2.2 Midi out as sounds
On the as-sounds channel instead of the key presses and releases, midi is
sent the way it actually sounds. In this mode the Juno-66 will output the
arpeggiator, Powerarp, chord memory, Polychord and Monophonic modes
including retrigger information. Sustain events will not be sent as midi
massages but rather simulated with note on and off events.
When Mono B mode is selected the next note on event will be sent before
the note off event. By most monophonic synths this can be interpreted as
a ’glide’s command.
7.3 Arpeggiator and Sample and Hold Trigger
The Arp and Sample and Hold clocks can be selected to trigger by the
internal arp or midi. (see config menu). There are two midi trigger modes.
when ’midi note’ is selected as the trigger input, the trigger is midi note 0
(for the Arp) and midi note 1 (for the Sample and Hold)
When ’midi clock’ is selected, the Arp and Sample and Hold will trigger
in sync to the received midi clock. You can choose between a number of
dividers for the midi clock to achieve various clock frequencies by sending
midi controller messages (see midi controller chart). The table below shows
the controller values and the resulting frequency in bars. You can also set
the dividers in the config menu.
Ctrl val 0-7 8-15 16-23 24-31 32-39 40-47 48-55 56-63
Bars 2.5 2 1.5 1 3
41T 1 2
3
8
Ctrl val 64-71 72-79 80-87 88-95 96-103 104-111 112-119 120-127
Bars 1
2T1 4
3
16
1
4T1 8
1
8T1 16
1
32
Table 1: Midi controller settings for arp and S/H LFO clock divider
7.4 Filter over midi
The Juno-66 features midi filter control. Controller massages received on
controller number 17 will modulate the filter. The default value is 0.

16 8. ADDITIONAL FILTER ADSR
The filter S/H LFO and the triangular LFO can also be controlled using
midi.
7.5 Program change
The Juno-66 responds to program change commands and changes the play
mode. It also sends program change commands when changing the play
mode. The following table shows which program number corresponds with
which play mode:
Program number Play Mode
0 Poly
1 Duo
2 Mono
3 Chord
4 Polychord
Table 2: Midi program numbers and play modes
7.6 Pitch Bend
If the hardware is installed, the pitch bend can be controlled using midi by
sending pitch bend commands. Use the Juno’s amount sliders next to the
bender to set the amount of pitch bend and/or filter modulation.
8 Additional filter ADSR
The Juno-66 features an additional ADSR envelope for the filter. It is a
global envelope. This means there is not one envelope for each voice but
one shared by each voice. In Poly, Duo, Three voice modes the envelope is
retriggered after all keys had been released. in Mono A mode it is retrigged
with each key press, in Mono B mode it is not retriggered when playing
legato.

17
Envelope parameters attack, decay, sustain, release and amount can be
controlled via midi controller messages. The range of the parameters is
very wide: From a couple of milliseconds on the low end up to 5 seconds
on the longest setting. The parameter control low is logarithmic to ensure
a good control over the whole range.
9 Triangular filter LFO
The Juno-66 features an additional LFO for the filter which outputs a tri-
angular waveform.Its frequency can be adjusted from 0,12Hz - 8kHz using
a fine and coarse control. The amount can also be adjusted. See the midi
controller chart for corresponding controller numbers.
10 S/H filter LFO
This is a build in sample and hold style LFO that controls the filter. A
random value is created on every s/h clock event and sent to the filter.
This simulates the effect of the sample and hold LFOs common in analog
synthesizers, where a noise source is periodically sampled to get a new
random value each time.
You can choose between three different clock sources by using the config
menu. The internal arp clock, midi clock and midi trigger. The midi clocks
divider can be adjusted in the config menu or via midi. When midi trigger
is selected, the S/H will trigger when note C#-2 is played (second lowest
midi note).
You can control the amount of this LFO by using the controller number

18 11. CONFIG MENU
shown in the midi controller chart or by using the config menu.
11 Config menu
In the config menu various parameters can be adjusted. For some param-
eters a value can be selected by using the lower 17 key of the keyboard,
others can be selected with a single key press. Parameters that are also
controlled using midi are saved when pressing any unused key in the konfig
menu. You could for example set the portamento times using a midi con-
troller and then save them in the config menu.
The figure below shows the parameters and how they are assigned to the
keys. A larger version is provided at the end of this manual.
11.1 Enter and exit the config menu
To enter the config menu without having any key pressed on the keyboard,
press the KEY TRANSPOSE button until its led starts blinking. To exit
the config menu press it again.
11.2 Configure Midi Channels
Midi send an receive channels can be configured by pressing ’Midi In’, ’Midi
out as-sounds’ and ’Midi out as-played’ key and then selecting the channel
with the lower keys. Midi in channel can be switched to ’omni’, midi out
channels can be turned off.
11.3 Portamento settings
To set times / speed for ’Slow’ and ’Fast’ settings, press the ’Speed fast’ or
’Speed slow’ key, then use the lower 17 keys to select a speed.
To switch between ’Constant time’ and ’Constant speed’ modes, press the
coresponding buttons.

11.4. DETUNING, SCALES AND FATNESS 19
11.4 Detuning, Scales and Fatness
Press the Detuning and Fattnes keys and then use the lower 17 keys to set
their parameters. The lowest key produces a very clean sound, (no fatness
or detuning). Increasing the parameters will make the sound more alive,
extreme parameter settings might sound detuned and experimental.
Press the scale key then use the associated lower keys to select a tuning or
the 17th key to select a custom tuning.
11.5 Configure arp trigger
The arp trigger source can be selected by pressing the ARP ’Internal’, ’Midi
note’,’and midi clock’ keys.
The midi clock divider for the arp can be adjusted by pressing the ARP
’Divider’ key and then selecting the divider with the lower 17 keys. The
table below shows which key belongs to which divider.
11.6 Configure S/H trigger
The S/H trigger source can be selected by pressing the S/H ’Internal’, ’Midi
note’,’and midi clock’ keys.
The midi clock divider for the S/H can be adjusted by pressing the S/H
’Divider’ key and then selecting the divider with the lower 17 keys. The
table below shows which key belongs to which divider.
11.7 S/H LFO amount
The S/H LFO amount can be set by pressing the S/H amount key and then
using the lower 17 keys to set the amount. The OFF key will switch the
S/H lfo off.
11.8 Duo and Three voice
Use the DUO and TRI keys to select between Duophonic and Three voice
modes.

20 12. TIPS AND TRICKS
11.9 New-school and Old-school chord memory modes
Use the NEW and OLD keys to select between New-school and Old-school
chord memory modes.
11.10 Auto portamento
Use the Auto-porta ON and OFF keys to select wheater auto portamento
in Mono B mode is active or not.
11.11 Pitch bend calibration
To perform pitch bend calibration set the tune knob to the center position,
make sure the pitch bend wheel is at center and then use midi to send midi
pitch bend messages until the synth is in tune. In the config menu press
’pitch bend cal’ to save the current setting as the new pitch bend center
position.
11.12 Factory reset
To perform a factory reset press the highest note on the keyboard (C5).
It will take a couple of seconds to complete. When the HOLD led starts
blinking again, factory reset is finished.
12 Tips and tricks
12.1 Transferring a melody to Powerarp
You can transfer a melody from an external sequencer to the Juno-66 Pow-
erap sequencer by going into Powerarp record mode and than sending the
melody to theJuno-66 midi in channel.