Module	Description	Controls & Ins/Outs
	BD99 Bass/Elec.Tom Drum Module The BD99 is an accurate replica of the TR909 bass drum sound. The module is entirely discrete analogue circuitry, based as closely as possible on the original. The original TR909 has a tune control. This really sets envelope sweep on the pitch, so we have named this control Sweep on the BD99 for accuracy. Analogue solutions have added a true tuning control which enables the pitch to be changed. The pitch can be brought right up, enabling electronic Tom and Conga style sounds to be produced. Also, by modulating the pitch via the Tune CV input with a high frequency signal (CV or Audio), new and excinting waveforms can be produce. This radically changes the sound of the BD99, effectively turning it into a drun synth. The BD99 can be tuned way low with long decays.	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: Sweep, Tune, Attack, Decay, Level Indicators: Trigger LED Size: 10HP

Module

Description

Controls & Ins/Outs

BD99 Bass/Elec.Tom Drum Module

The BD99 is an accurate replica of the TR909 bass drum sound. The module is entirely discrete analogue circuitry, based as closely as possible on the original.

The original TR909 has a tune control. This really sets envelope sweep on the pitch, so we have named this control Sweep on the BD99 for accuracy. Analogue solutions have added a true tuning control which enables the pitch to be changed. The pitch can be brought right up, enabling electronic Tom and Conga style sounds to be produced.

Also, by modulating the pitch via the Tune CV input with a high frequency signal (CV or Audio), new and excinting waveforms can be produce. This radically changes the sound of the BD99, effectively turning it into a drun synth.

The BD99 can be tuned way low with long decays.

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:
Sweep, Tune, Attack, Decay, 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 kick.

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

Controls

Sweep Called `Tune' on original TR909. Sets the amount of envelope sweep on the pitch.

Tune Sets tuning of drum sound

Attack Controls `click' level (like stick hitting drum skin). The click you hear is actually a burst of filtered noise.

Decay Sets decay time .

Level Sets output level