tiptop-audio-sd909

Tiptop Audio SD909

Authentic TR-909 snare drum in Eurorack format

8 HP Eurorack module

The SD909 is an exact analog recreation of the Roland TR-909 snare drum circuit adapted for Eurorack modular use. It faithfully reproduces the classic 909 snare sound using internal VCOs and a binary noise generator, while adding voltage control over noise frequency, tune, and accent for expanded sonic exploration. The module also provides a raw noise output, making it a dual-purpose percussion voice and noise source.

Features

  • Exact analog recreation of TR-909 snare drum circuit
  • Original TR-909 controls: Tone, Tune, Snappy
  • Independent accent level control (unlike original TR-909 global accent)
  • Voltage-controlled binary noise generator (original TR-909 noise was fixed)
  • Raw unfiltered noise output (NOISE OUT) for use as external sound source
  • VC-NOISE input for CV control of noise clocking frequency
  • VC-TUNE input for CV control of internal VCO pitch
  • ACCENT IN accepts gate/trigger or CV signal
  • Gate normalled to accent input when ACCENT IN is unpatched
  • Front panel 909 reference dots indicating original TR-909 control positions
  • Trigger button for manual triggering
  • Snappy range exceeds original TR-909 for extended sound design

Controls & Jacks (14)

  • Trigger— Trigger input button to fire the snare drum sound
  • SD Out— Main audio output of the SD909 snare drum
  • Noise Out— Output of the pure unfiltered TR-909 binary noise generator
  • VC-Noise— Voltage control input for noise generator frequency
  • Tune— Controls the pitch of the internal VCOs
  • VC-Tune— CV input for controlling VCO pitch
  • Tone— Voltage control input for VCO pitch tuning
  • Gate In— Gate input for triggering the snare drum; normalized to accent input when not patched
  • Accent In— Accent CV or gate input for dynamic control; breaks normalization when patched
  • Noise— Controls the level of the noise generator; set to marked 909 region for authentic TR-909 sound
  • Level— Controls the gain of the noise section to balance noise vs oscillator kick sound
  • VC— Voltage control knob for modulating snare parameters
  • Snappy— Controls the length of the noise component in the snare drum
  • ACC— Controls the accent level; also acts as fine gain control when accent input is not patched

How-To Guides

  • Classic TR-909 Snare
  • Metallic Industrial Snare
  • 909 Noise as External Sound Source
  • Dynamic Accent Groove
  • Accent Knob as Fine Gain Trim
  • CV-Tuned Tonal Snare
  • CV Noise Frequency Sweep Texture
  • Punchy Rave Snare
  • Rimshot-Style Tight Snap

Explore the interactive SD909 panel on BleepDex — tap any control to learn what it does.

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