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"The CGS747 Cynare Drum Simulator is a euro version of the third in the series of CGS drum simulators. It generates a single drum sound that can be adjusted to sound like a cymbal, hi-hat, snare drum, electronic drum, or numerous other percussive sounds. It is a complete dedicated synthesizer in its own right, including six oscillators, a noise source, a mixer, an envelope generator, a VCF and a VCA.
Some ideas on how to use this module:
There are two inputs for controlling the envelope of the generated sound. The first is Decay. Attack is preset at the fastest rate possible, the decay controlling the fall off rate of the envelope. This decay is also affected by the Damper control, which operates in parallel with the Decay. A gate input into the Sustain jack disables the damper, thus allowing two different rates of decay to be set depending on the input to the sustain jack. Note: if the damper decay rate is set to minimum, and the sustain input is below about 2V, the envelope will be set at minimum, with the decay control having very little effect, so if you do not wish to use the sustain input, the damper decay rate should be turned to maximum.
If a square wave or similar gate waveform is connected to both the sustain and trigger inputs, the fall-off of the envelope will be affected by the decay control while the gate signal remains high, the damper kicking in as soon as the gate falls low. This allows for easy implementation of open/closed hi-hat sounds etc.
A little on how it works:
Incoming trigger and sustain signals trigger the onboard envelope. If the sustain gate signal is low, the envelope is run through the damper section. Otherwise, if the sustain gate signal is high, the envelope is only controlled by the decay knob. An LED indicates whether or not the damper is active.
The envelope is also passed through a processor that allows it to be scaled and inverted via the bi-polar envelope knob, giving a range of positive and negative envelopes to drive the VCF.
There are two noise generators, a conventional one, and a "shimmer" generator consisting of six independent oscillators with their outputs "ring" modulated via the exclusive OR gates, and mixed.
A knob allows the ratio of noise to shimmer to be adjusted. A filtered version of the trigger pulse is used to generate an impact sound, and this is mixed with the output of the shimmer/noise section.
The filter section is directly taken from the Steiner VCF.
Features
Trigger and Sustain Inputs for envelope
Envelope Decay and Damper level
6 "Shimmer" Oscillators with level knob
"Noise Shimmer" with bi-polar level knob
"Impact" with level knob
VCF section based on the Steiner VCF
Mode switch for selecting Highpass, Bandpass, or Lowpass VCF mode
VCF Cutoff Frequency and Resonance Knobs
CV input with level knob
Routing switch selects if the VCA is before or after the VCF in the signal path
Output"
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