tiptop-audio-rs909

Tiptop Audio RS909

Authentic TR-909 rimshot analog percussion for Eurorack

4 HP Eurorack module

The RS909 is a one-to-one analog clone of the Roland TR-909 rimshot sound generator adapted for Eurorack modular use. It faithfully reproduces the classic 909 rimshot timbre while adding independent oscillator frequency control and per-module accent control absent from the original machine. The result is a punchy, cracking percussion voice with the authentic snap and attack character of vintage drum machine hardware.

Features

  • One-to-one analog clone of Roland TR-909 rimshot circuit
  • Three internal oscillators with two user-accessible frequency controls (OSC-1, OSC-2)
  • Independent per-module accent level control knob
  • ACCENT IN normalized to GATE IN when unpatched, enabling maximum output level by default
  • ACCENT knob acts as fine output gain trim when no external accent signal is connected
  • ACCENT IN accepts gate, trigger, or CV signal for dynamic accent variations
  • LEVEL knob for coarse output volume adjustment
  • MixBus jumper for direct connection to Tiptop MIXZ mixer module
  • Eurorack +/-12V power compatible, adapted from original +/-15V TR-909 design
  • SMT manufacturing with period-correct sound character

Controls & Jacks (7)

  • Level— Controls the overall output level of the rimshot sound.
  • OSC 1— Tunes the frequency of the first bridged-T oscillator, affecting the pitch character of the rimshot.
  • OSC-2— Tunes the frequency of the second bridged-T oscillator, interacting with OSC1 to create the metallic rimshot timbre.
  • Accent— Sets the accent intensity, boosting the rimshot output level and brightness when triggered via Accent In.
  • Accent In— Trigger input for accented hits. When triggered, increases output level and brightness according to the Accent knob setting.
  • Gate In— Gate/trigger input for firing the rimshot. Accepts standard Eurorack gate or trigger signals.
  • RS Out— Audio output for the rimshot sound.

How-To Guides

  • Authentic 909 Rimshot
  • Dynamic Accented Rimshot Pattern
  • CV-Controlled Accent Morphing
  • Accent Knob as Fine Gain Trim
  • High-Frequency Snappy Rimshot
  • Detuned Woody Rimshot
  • MixBus Drum Bus Integration
  • Kick-Accented Rimshot Energy

Explore the interactive RS909 panel on BleepDex — tap any control to learn what it does.

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