4ms-percussion-interface

4ms Percussion Interface

Acoustic-to-CV drum trigger and envelope generator

4 HP Eurorack module

The 4ms Percussion Interface converts acoustic drum hits into Eurorack-compatible gate and envelope signals. Connect a piezo pickup to the input, and each strike generates a gate pulse and a shaped CV envelope. Two modes let you either follow the dynamics of your playing (Follow) or generate a consistent envelope shape on every hit (Gen). At just 4HP, it bridges the gap between acoustic percussion and modular synthesis without taking up much rack space.

Features

  • Converts acoustic drum hits to CV gate and envelope signals
  • Two modes: Follow (dynamics-tracking) and Gen (fixed envelope)
  • High-impedance input optimized for piezo contact microphones
  • Adjustable sensitivity, sustain, and envelope decay
  • Ultra-compact 4HP form factor
  • LED indicators for signal, gate, and envelope activity

Controls & Jacks (11)

  • Sensitivity
  • Sustain
  • Env. Decay
  • Follow/Gen
  • In
  • Gate
  • Env. Out
  • Signal LED
  • Gate LED
  • Gen LED
  • Env. Out LED

How-To Guides

  • Acoustic Drum Trigger
  • Dynamic Expression Controller
  • Drum Pad to Modular Gate/Envelope
  • Threshold Calibration for Crosstalk Rejection
  • Velocity-Sensitive Filter Modulation
  • Audio-Rate Envelope Following

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

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