MFB Clap-522 User manual
General
The Clap-522 module is based on a slightly modified circuit of the clap sound source in
MFB’s drum computer model 522. The sound can be manually edited in different parameters.
In addition three functions can also be controlled or modulated by CV-signals like envelopes
LFOs or step-sequencers.
Set-Up
The Clap-522 is fully compatible to Doepfer’s A-100 modular system - in size bus-power and
CV/Gate voltage. Connect the 10-pin MFB-cable to a corresponded 16-pin jack on the MFB
MIDI/CV circuit-board or Doepfer’s mainframe bus. Supply voltage needs to be +/- 12 volts
5-volt connections are not required. The wattage is +/- 30 mA the module size 8 HP = 40 mm.
ATTENTION: Please check for correct polarity! The colored side of the connector-cable
needs to point downwards so that the cable is not twisted.
Functions
The clap sound is triggered by the In input. Common triggers are analogue or digital gate-
signals of a step-sequencer a MIDI-CV/Gate-converter or a square-LFO. Alternatively drum
pads dynamic or piezo-trigger-microphones may also be used. Dynamic triggering will not
only affect the sound’s volume but also the attack and decay times slightly.
Sens is a trim control to adjust the input’s sensitivity to the trigger-signal. The highest
sensitivity allows triggering at a minimum voltage of around 0.1 volt. The input reacts to the
positive slope of the signal.
Parameters
The clap-sound is based upon a filtered noise sound source. Internal VCAs are used to
separate the noise into two phases: an initial sequence of consecutive claps and a following
decay stage.
Wide controls the length of the individual claps. Not to be confused with the overall release
time for the sound that is set using Decay. Depending on the setting of these controls the
effect of Decay ranges from marginal to clear.
The Pulse control sets the number of clap-repetitions during the initial sound stage.
With Filter you can control the frequenz of the bandpass.
Attack controls the noise between the claps
The decay stage is set by the Decay control. Although not a reverb but a noise-decay this
control adds a reverb-like flavor to the sound comparable to the clap-sound in Roland’s TR-
808. To “disable” the reverb-effect turn this control fully counter clockwise and you will only
hear the dry clap-sounds of the initial stage. With the control turned fully clockwise the
reverb-effect will last approximately one second. With the decay input you can control the
decay too.
Pulse Filter Attack and Decay can also be externally controlled by their correspondent CV-
inputs. Try using CV-sources like LFOs a Theremin-controller or envelope generators. For
each inputs the poris work as an attenuators
M-BUS
The module offers the new developed M-Bus connector whats mean you can you control
everything via Midi/CV interface or our new SEQ-01 Pro drumsequencer without additional
patching. Modules get connected serial M-Bus to first modul first modul to second modul
and so far .. Following adresses are supported:
Trigger without Velocity
Midi Note #39. With velocity you can controll the Pulse.
MIDI Controller values for:
Filter = #20
Attack = #28
Decay = #36
Wide = #44
The controller will be ignored after another Clap-modul was triggerd. For Claps the MIDI
note #39 and #89 are reserved.
Note: The value of controller will be added to the pots. The required voltage for all CV-
inputs needs to be within a range of 0 to 5 volts.
Owners manual
Module Clap-522
