4MS Percussion Interface and Expander
The PI (percussion interface) turns virtually any audio source from microphone, instrument and line level into CV and clock/gate signals.
The PI and PI Expander are suited for synchronising sequencers or other modules to the rhythm of an audio track or live percussion. The modules can simultaneously be used as a pre-amp for microphones or line-level signals, while generating inverted envelopes useful for side-chaining. The PI module contains all the core functionality and can be used without the Expander to conserve space. The Expander requires the main PI modules and adds three gain stage options, a modular-level audio output jack, a 1/4" (6.35mm) input jack, and envelope attenuation capabilities. The two modules are only sold together, they are not available separately.
Video: https://youtu.be/QxHfp9YFXQM?t=836
Product Specs
- Item Number: 16111
- Make: 4ms
- Model: Percussion Interface
- Condition: Brand New
- Finish: White
- Categories: keyboards-and-synths ⇒ eurorack
- Function: Envelope Follower External Envelope Generator
- Made In: United States
- MPN: PI+EXPw
- Modular Grid: Eurorack ⓘ +
- Dimensions*: 4 HP 25 mm deep
- Power*: 69 mA +12V 56 mA -12V 0 mA 5V
* User contributed details
Product Information
Product Information
Shipping & Returns
Shipping & Returns


4MS Percussion Interface and Expander
4MS Percussion Interface and Expander
The PI (percussion interface) turns virtually any audio source from microphone, instrument and line level into CV and clock/gate signals.
The PI and PI Expander are suited for synchronising sequencers or other modules to the rhythm of an audio track or live percussion. The modules can simultaneously be used as a pre-amp for microphones or line-level signals, while generating inverted envelopes useful for side-chaining. The PI module contains all the core functionality and can be used without the Expander to conserve space. The Expander requires the main PI modules and adds three gain stage options, a modular-level audio output jack, a 1/4" (6.35mm) input jack, and envelope attenuation capabilities. The two modules are only sold together, they are not available separately.
Video: https://youtu.be/QxHfp9YFXQM?t=836
Product Specs
- Item Number: 16111
- Make: 4ms
- Model: Percussion Interface
- Condition: Brand New
- Finish: White
- Categories: keyboards-and-synths ⇒ eurorack
- Function: Envelope Follower External Envelope Generator
- Made In: United States
- MPN: PI+EXPw
- Modular Grid: Eurorack ⓘ +
- Dimensions*: 4 HP 25 mm deep
- Power*: 69 mA +12V 56 mA -12V 0 mA 5V
* User contributed details
Original: $199.62
-65%$199.62
$69.87Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
The PI (percussion interface) turns virtually any audio source from microphone, instrument and line level into CV and clock/gate signals.
The PI and PI Expander are suited for synchronising sequencers or other modules to the rhythm of an audio track or live percussion. The modules can simultaneously be used as a pre-amp for microphones or line-level signals, while generating inverted envelopes useful for side-chaining. The PI module contains all the core functionality and can be used without the Expander to conserve space. The Expander requires the main PI modules and adds three gain stage options, a modular-level audio output jack, a 1/4" (6.35mm) input jack, and envelope attenuation capabilities. The two modules are only sold together, they are not available separately.
Video: https://youtu.be/QxHfp9YFXQM?t=836
Product Specs
- Item Number: 16111
- Make: 4ms
- Model: Percussion Interface
- Condition: Brand New
- Finish: White
- Categories: keyboards-and-synths ⇒ eurorack
- Function: Envelope Follower External Envelope Generator
- Made In: United States
- MPN: PI+EXPw
- Modular Grid: Eurorack ⓘ +
- Dimensions*: 4 HP 25 mm deep
- Power*: 69 mA +12V 56 mA -12V 0 mA 5V
* User contributed details


















