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4ms Percussion Interface and PI Expander Eurorack Modules

2 x 4HP Audio Signal-to-CV/Gate/Clock Signal Converter Eurorack Modules
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Item ID: 4msPiExp
4ms Percussion Interface and PI Expander Eurorack Modules
Price:$165 and 00 cents
$28.00 suggested monthly payments with 6 month financing‡

We Can Get It Fast!

While this isn't an item we normally stock, we can still get it to you as fast as possible due to our great relationship with 4ms. Go ahead and place your order and we'll follow up shortly to let you know when to expect it. Estimated May 2026.

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4ms Percussion Interface and PI Expander Eurorack Modules
We Can Get It Fast!
Price:$165 and 00 cents
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Eurorack Meets Live Percussion

Incorporate acoustic drums and percussion into your Eurorack rig with the 4ms Percussion Interface and Percussion Interface Expander Eurorack module set. This simple but powerful combo converts audio signals into CV and clock/gate signals, for syncing sequencers and other time-based modules to live percussion performances. The PI Expander features three gain stage options, L/M/H, to accommodate everything from line-level signals and drum machines to cheap toy microphones and piezos via its 1/4-inch input jack. On the Percussion Interface module, a sensitivity knob allows you to adjust how much signal is required for the device to fire; sustain and decay controls let you fine-tune the device’s responsiveness to prevent misfires, as well as control gate and envelope length. Additionally, you can set the module as an envelope generator or follower to respond to playing dynamics. Synthesists at Sweetwater were also pleased to see an inverted envelope output, ideal for creative ducking applications. If you're searching for a fun way to merge Eurorack and live percussion, you'll want to check out the Percussion Interface and Percussion Interface Expander Eurorack module set from 4ms.

4ms Percussion Interface and PI Expander Eurorack Modules Features:

  • Incorporate acoustic drums and percussion into your Eurorack rig
  • 2 module set converts audio signals into CV and clock/gate signals
  • Three gain stage options L/M/H accommodate a range of input levels
  • Sensitivity knob adjusts how much signal is required for the device to fire
  • Sustain and decay controls let you fine-tune the device’s responsiveness
  • Inverted envelope output for creative ducking applications
  • Power Usage: 104mA (+12V); 65mA (-12V)
  • Module(s) Width: 4HP
  • Module(s) Depth: 25mm

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Tech Specs

  • Type: Eurorack Percussion Interface & PI Expander
  • Depth: Percussion Interface: 0.98" (25mm), PI Expander: 1.13" (28.7mm)
  • HP Size: 2 x 4HP
  • Power Usage: With PI Expander: +12V/104mA, -12V/65mA, Without PI Expander: +12V/69mA, -12V/56mA
  • Power Supply: Requires Eurorack case and power supply
  • Manufacturer Part Number: PI+EXP

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