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4ms Percussion Interface and PI Expander Eurorack Modules , $165.00 - Add to Cart Skip to Product Information

4ms Percussion Interface and PI Expander Eurorack Modules

2 x 4HP Audio Signal-to-CV/Gate/Clock Signal Converter Eurorack Modules
Be the first to review Item ID: 4msPiExp
4ms Percussion Interface and PI Expander Eurorack Modules
4ms Percussion Interface and PI Expander Eurorack Modules

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 September 10, 2026

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4ms Percussion Interface and PI Expander Eurorack Modules
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 September 10, 2026

Eurorack Meets Live Percussion

This article was Written By

Our Product Research Team

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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

Warranty Info

Sweetwater's FREE 2-Year Total Confidence Coverage Warranty

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  • Get back to making music with the industry's fastest turnaround time
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Offer applies only to single-receipt qualifying purchases. Select manufacturers may require that only the manufacturer’s products qualify towards the minimum purchase amount needed to be eligible for promotional financing. Otherwise, an invoice that meets the minimum purchase amount and contains at least one qualifying manufacturer product is eligible for promotional financing. No interest will be charged on promo purchase balance, and equal monthly payments are required on promo purchase until it is paid in full. The payments equal the amount financed divided by the number of months in the promo period, rounded up to the next whole dollar. These payments may be higher than the payments that would be required if this purchase was a non-promo purchase. During the last month(s) of the promo period the required monthly payment may be reduced due to the prior months’ rounding. Regular account terms apply to non-promo purchases. New Accounts as of 07/31/2025: Purchase APR is 34.99%. Penalty APR is 39.99%. Min Interest Charge is $2. Existing cardholders: See your credit card agreement terms. Subject to credit approval.

Offer applies only to single-receipt qualifying purchases. No interest will be charged on the promo balance if you pay it off, in full, within the promo period. If you do not, interest will be charged on the promo balance from the purchase date. The required minimum monthly payments may or may not pay off the promo balance before the end of the promo period, depending on purchase amount, promo length and payment allocation. Regular account terms apply to non-promo purchases and, after promo period ends, to the promo balance. New Accounts as of 07/31/2025: Purchase APR is 34.99%. Penalty APR is 39.99%. Min Interest Charge is $2. Existing cardholders: See your credit card agreement terms. Subject to credit approval.

The estimated required monthly payment shown which excludes taxes and delivery equals the amount financed divided by the number of months in the promo period, rounded up to the next cent. During the last month(s) of the promo period the required monthly payment may be reduced due to this rounding. These payments apply only with the financing offer shown. If you make these payments by the due date each month, you should pay off this amount financed within the promo period, if it is the only balance you are paying off. If you have other balances on your account, this payment will be added to any other minimum monthly payments.

Applies only to select items from this manufacturer. Ask your Sweetwater Sales Engineer for more details.