Tiptop Audio SD909 User Manual
Introduction.
The SD909 module is an exact recreation of the original TR-909 snare drum
analog sound generators adapted for modular synthesizer use. The front panel
contains all of the controls found on the original TR-909 drum machine, in addition
we have added more controls to further enhance the sound palette of this great
analog circuit. The SD909 also includes the TR-909 white noise generator as an
extra sound source in the system, and unlike the TR-909, the noise source in
the SD909 is voltage controlled.
Let’s get started.
Plug the SD OUT to a mixer, set the knobs position similar to the drawing below
and hit the Trigger Button.
PRESET LP STAR TLOOP LP END ZOOM
1
TAP BOSS INT EXT
2
BEAT- C BEAT- P
3
4
5
6
7
8
CHANNEL
STEPS MUTE
SEQUENCER SD909 MI XER
BUS MIX
MIXZ
OUT A
MIXER B
GAIN
OUT B
SLOT
COPY CLEARPAST E
RANDOM
LENGTH REVERSE
REVERSE
ZOOM GLOBAL
REPEAT
FILL
TRIG1
TRIG2
TRIG4
TRIG5
TRIG7 TRI G8 ST/STOP VERTICAL
CLOCK
OUT
1
1
2
2
3
3
SWING
1 x64
2x32
CLOCK OUT
TRIG3
TRIG6
RESET OUT
4x1 6
CLOCK IN
8x8
RESET IN
4
4
5
5
6
6
7
7
8
8
MIXER A
To set the exact sound of the TR909 the sounds from the internal oscillators and
noise generator need to be balanced correctly. The SD909 NOISE and ACCENT
controls are the main ones controlling that. The front panel has regions marked
with a dot and labeled 909, which are the original settings. Since this is an analog
circuit and tolerance varies we marked regions instead of an exact spot. Go ahead
and turn NOISE all the way up and slowly bring it back toward the dot, as the gain
starts to increase that is where the control needs to be. Set the accent where the
dot is. Now set the SNAPPY to balance the noise vs the oscillators sound.
2
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