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I2 Instrument Interface - 11HP

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Item: N13-4875

Availability: Out of stock

I2 Instrument Interface - 11HP


Sometimes the interaction between a modular system and other musical instruments (electronic or acoustic) is needed. With an envelope follower circuit we can achieve a direct control of the amplitude of the signal.It will produce a control voltaje proportional to the amplitude. Allowing a real communication between our system and the external sound source.

Instrument interface module has a handful of functions. 

Preamp: With two audio inputs (6.5 jack and Minijack/banana), input amplification is controlled with “GAIN” pot, controlling the amplitude of the envelopes that will be generated. Minimum signal required to generate the maximum envelope is 200mV peak and allows up to 5v input.

Band Pass Filter: The signal will pass thru a band pass filter with cutoff frequency and band width control via “FREQ” and “WIDTH” pots. Like this we will select the frequency range that will generate our control signal. After this stage the signal will be outputted with synth level via “AUDIO OUT”.

Envelope Follower: After filtering the signal it will feed “RESPONSE” stage, that will determine envelope follower response velocity. It features a “HIGH”, “MEDIUM” and “lOW” selector switch to get an optimal envelope for different kind of signals. “FOLLO OUT” will output the envelope extracted and show us it’s level via a LED. Green: Medium level, Orange: High level and Red: Max. Level.

Envelope Regenerator: “REGE OUT” is a re-generated envelope that will allow controlling the rise of the envelope with “ATTACK” and the fall with “DECAY”, making them longer or shorter. It features a LED indicator for the regenerated envelope level. Green: Medium level, Orange: High level, Red: Max. Level.

Trigger Extractor: With “THRESHOLD” pot we control the level of a comparator that determines when “GATE OUT” and “TRIGG OUT outputs will be activated. “GATE OUT” will be at high level while the envelope is over the threshold we set, while TRIGG OUT is present just when the threshold is passed. Indication LEDS will show when the outputs are active.


  • External audio input interface
  • Preamp for gain staging external audio
  • Bandpass Filter for tone shaping
  • Envelope Follower for modulation controls dependent on input volume
  • Envelope Regenerator with attack and decay slew levels
  • Trigger Extractor provides a gate when the volume passes a decided threshold

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  • Eurorack Module
  • Width: 11HP
  • Depth: 45mm
  • Current Draw: 40mA @ +12V, 35mA @ -12V

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