Drolo stamme n V4 User manual

stamme[n] V4
Stamme[n] is a pedal that originated from an
initial idea of Kent Sommer (aka UglyCasanova
and now digitalorafx). He asked me if I could
make him a pedal that would loop short
samples and had tap tempo. It seemed like a
fun project and while working on it I decided
to add more features. In the end it became an
ofcial drolo product and I really want to
thank Kent for his input, ideas and the nice
chats.
From that initial tap tempo micro looper idea,
the pedal has evolved over the years into a
micro looper / time stretcher / glitch delay /
tape machine / innite sustainer / reverb.

The hold modes
These modes are in fact reverbs that can be set to sustain innitely (well almost,
they do start to degrade slowly after a few minutes).
SW (swell)
The control knob denes how fast the sustained reverb fades in and out.
NOTE: in order to allow the audio to fade out appropriately, in this mode the
output of the effect will remain connected even when the pedal is bypassed.
PT (pitch)
The control knob changes the pitch of the reverb.
From left to right:
- 1 octave
- 7 semitones
- 5 semitones
unison
+ 5 semitones
+ 7 semitones
+ 1 octave
FL (lter)
The reverb gets processed through a tilt lter.
The control knob goes from a low pass lter on the left to a high pass lter on
the right.
ST (stutter)
The reverb gets randomly chopped off.
The control knob adjusts the rate of the chopping.
The looping modes
ML (tap tempo micro looper)
The length of the recording can be set manually with the control knob or by
tapping the tempo with the tap switch.
Adjusting the tempo manually with the control knob while a loop is playing will
change the pitch and content of the loop in a destructive manner. When turning
the control knob after you have tapped a tempo,the pitch change does not occur.
Instead, the control knob is then used to dene the tap tempo multiplier and its
range is divided in 4 sections.
Turning from left to right the multiplier is : 8x - 4x - 2x - 1x
SL (stretch looper)
Recorded audio gets looped and can be time stretched.
The control knob denes the amount and direction of the stretching.
From the left to noon position it will start to increasingly stretch the recording
and from noon to right it will start to playback the samples in reverse order.
GL (glitch delay):
The delay time randomly changes and the repeats will randomly loop.
From left to noon, the control knob fades in second delay line that runs at twice
the speed (pitched one octave up). From noon to right it will increasingly start
to feedback that line onto itself.
TL (tape loop):
Records short loops of tape that can be played back at a speed and direction set
by the control knob.
From left to right:
reversed, double speed, one octave above
reversed, a fth above
reversed, half speed, an octave below
forward, normal speed, unison
forward, half speed, an octave below
forward, a fth above
forward, double speed, one octave above

Basic Operation
drolo
When disengaged, the pedal is always recording the
incoming audio. The length of the recording is dependent
on the sample rate knob (from ~0.8 to ~3.2 sec). When you
press the ON switch it will start playing back and looping
the last recording.
If you press ON again it will stop playing back and will
resume recording. Depending on the given mode and
settings the recording will not necesarily get deleted
immediately and replaced by new content. There may be
times where there is still some residue from the previous
recording if you engage the pedal again fast enough.This can
be used quite creatively as it lets you punch in new chunks
of audio whithin the existing recording, if you do it quickly
enough.
When the pedal is engaged and playing back the recording,
you can use the left RECORD switch to add more layers of
sound without interrupting the playback. As you record
more audio, older content of the memory gets faded out.
(except in the ML mode where the left footwitch is only
used for tap tempo) If you leave the RECORD switch
engaged, it actually turns the looping effects into ‘live’ ones,
that are constantly regenerating and the hold effects
become actual reverb effects.
If you want to start in live mode when engaging the pedal,
simply leave the RECORD switch activated.
Common to all modes are the wet and dry knobs. They
provide unity gain in their noon position and allow to boost
or reduce the signals.
The big control knob adjusts a parameter that is different
for each mode.
The sample rate knob allows you to adjust the overall speed
at which the DSP chip will operate.
As a rule of thumb:
Lower sample rate = longer recording time, lower audio
quality, lower lter frequency range, slower fades
Higher sample rate = shorter recording time, higher audio
quality, higher lter frequency range, faster fades
If you adjust the sample rate knob while in play mode it will
change the pitch of the recording, a bit like a tape machine
would.The range of pitch spans over two octaves.

9v
exp
ML
SL
GL
TL
SW
PT
FL
ST
expression
input (TRS)
power
supply (9v)
audio
output
audio
input
wet
level
dry
level
sample
rate
control mode
selector
record/tap
switch
on
switch
ctrl/smplrt
Controls wet/dry:
Controls the level of the wet and dry signals. Unity gain is around
noon position.
sample rate
Controls the sample rate at which the DSP chip will run. It goes from
around 10kHz to 40kHz. At the lower extreme of this control you
might hear noise as the sample rate gets in the audio range.
mode selector:
Select one of the 8 modes.
When you change to a different mode, any recording will be deleted
and both of the footswitches get reset to their off position.
control knob
Its function will depend on the selected mode.
on switch:
When engaged, it will immediately start looping the recording.
If you give it a short tap (<0.3sec) it acts in latching mode.
If you press it for more than 0.3sec you are in momentary mode.
record/tap switch:
If you give it a short tap (<0.3sec) it acts in latching mode.
If you press it for more than 0.3sec you are in momentary mode.
(Except in TT mode where it is only used to tap in the tempo)
ctrl/smplrt switch:
Allows you to choose whether the expression input will control the
sample rate knob (right) or the control knob (left)

EXP input:
Can be used to externally control the pedal’s control knob
or sample rate knob with an expression pedal or CV source.
When something is connected to the exp input, the control
or sample rate knobs can be used to dene the max range
of the exp input.
Most commercially available expression pedals using a TRS
plug should work. The value is not really critical, although I
would not go lower than 10k.
You need to use 1/4 inch TRS (Stereo) plugs and cables. NO
MONO PLUGS OR CABLES! These will short out the
voltage regulators inside the pedal and possibly damage it.
Layout of the TRS connections:
If you really know what you are doing you can actually use a
control voltage instead of a resistance based controller but
you need to consider the connections and never exceed
3.3V.
If you have any doubt when deciding what to connect to the
expression input please send me an email and I will verify
that everything is safe.
Power Supply:
The power supply needs to be 9V/100mA center negative
like the com- monly used guitar pedal power supplies:
Make sure the polarity and voltage of your power supply is
correct or it will damage the pedal. Do NOT run at higher
voltages.
As the pedal uses a digital processor operating at high
frequencies, you may hear some noise if you use it on the
same power supply with other pedals (daisy chained) even
when it is bypassed.The noise can bleed through the power
supply into the other pedal’s signal.This is normal for such
devices. It might not be the case in your particular setup but
if you notice that, I would suggest using an isolated power
supply.
Specs:
Input Impedance: 1MΩ
Output Impedance : 1kΩ
Current : 80mA
Dimensions : 127mm x 95mm x 56mm
Thanks!
da[email protected]
https://www.drolofx.com
- tip: controlling pin
- ring: 3.3V supply voltage
- sleeve : ground