Module	Description	Controls & Ins/Outs
	SD99 Snare Drum Module The SD99 is an accurate replica of the TR909 snare drum sound. The module is entirely discrete analogue circuitry, based as closely as possible on the original.	Inputs: Trigger socket 5-12V Accent socket 0-12V Tune CV 0-12V Outputs: 3.5mm audio out 6.35mm audio out Power: +/-12V Controls: Tune, Tone, HPF, Snappy, Level Indicators: Trigger LED Size: 10HP

Use

The trigger input has a range of about 5 to 12V. A trigger pulse of around 1mS is recommended, although the gate output of a synth can be used. A larger trigger pulse will increase the level of the sound (accent the notes). When the accent socket is used, the trigger input socket only triggers the sound and the level of the sound is controlled by the voltage of the CV at the accent socket. The accent voltage can be from another trigger pulse generator, or from an LFO or Envelope. When using for example an LFO, you can have the level changing with the LFO sweep.

The Tune CV input can be used to alter the tuning with any voltage. E.g. use LFO for slow pitch sweeps. Using audio or any other high frequency signals to modulate tuning allows wild cross-modulated drum sounds to be produced. This sort of modulation of pitch provides an extreme range of sounds to be produced, aside from the standard TR909 style snare.

The trigger LED will light each time a trigger pulse is received.

Controls

Tone Sets the mix between the 2 oscillators that make up part of the sounds.

Tune 1 (sweep) Called `Tune' on original TR909. Sets the amount of envelope sweep on the pitch.

Tune 2 Sets tuning of drum sound.

Snappy Sets the noise level.

Level Sets output level.