MFB DRUM-05 User manual

General
The DRUM-05 module basically derives from the snare drum circuit found in the MFB-503. It
allows the same comprehensive sound editing. In addition, DRUM-05 offers CV-control over
the parameters Snap, Decay, Tune and Pitch. These parameters can be controlled by sources
like envelope generators, LFOs or step-sequencers.
Set-up
DRUM-05 is fully compatible to Doepfer’s A-100 modular system - in size, bus-power and
CV/Gate voltage. Connect the 10-pin cable to a corresponding 16-pin jack on the Doepfer
mainframe bus (or on the MIDI/CV circuit-board). Supply voltage needs to be +/- 12 volts, 5-
volt connections are not required. The wattage is +/- 30 mA, the module size 12 TE
(Teileinheiten) = 60 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 snare sound is triggered by the Trigger 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 attack, decay and pitch 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 approx. 0.1 volt. The input only reacts to
the positive slope of the signal.
Out carries the audio signal. This can be routed into a mixer (e.g. DRUM-99), a VCA or any
other sound manipulating module. You may also use the output to connect the DRUM-05
module directly to your mixing console or audio-interface.
Parameters/Controls
The snare drum sound consists of three parts: two oscillators that use a triangle-like waveform
and an additional noise part.
The oscillators’ pitch is adjusted by Tune. This parameter can be externally controlled by a
CV-source send to CV-input Tune with its corresponding attenuator.
The second path to pitch modulation is the Pitch control. This parameter sets the duration of a
predefined pitch-bending that is also preset in its modulation-depth. This creates a typical
sound-element of analogue tom-sounds as seen in products from Simmons or the TR909. The
corresponding attenuateable CV-input Pitch allows control of this parameter through an
external source, e.g. a CV-sequencer or LFO. Pitch duration will last approx. one second at its
maximum.
Snap sets the decay-time of the noise element and therefore for the overall length of the snare
drum sound. This parameter can be externally controlled using the attenuateable CV-input
Snap. The noise element of the sound is disabled when a CV-voltage of zero volts is applied.
Decay sets the duration (decay time) of the tonal sound-component. This parameter can be
controlled by an external source using the CV-input Decay with its corresponding attenuator.
Attention: The required voltage for all CV-inputs needs to be within a range of 0 to 10 volts.
Two additional parameters D-Tune and Noise, with corresponding controls on the top of the
module, can be adjusted manually: Noise sets the volume of the noise sound-component of the
snare-sound. D-Tune controls the amount of detuning between the two oscillators.

Operating Manual
DRUM-05
Snare Drum
Module