Xaoc Devices Sewastopol II Eurorack Envelope Follower Module

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Superb Audio Input module with Envelope Follower and Audio to CV capabilities.

Sewastopol is a multifunction eurorack module designed for easy interfacing of external gear to your modular environment. It can export line and professional level audio, import audio from instruments and electroacoustic transducers, and analyze the incoming audio to generate voltages and triggers to control your modular system.

This is a second, vastly improved revision to the original 2014 Sewastopol, featuring a completely redesigned preamplifier circuit, better ergonomics and various other improvements.


Audio input and output interface
External effects audio port
Versatile envelope follower with two wide ranges of operation and low-cut filter
Precise voltage comparator with hysteresis circuit for gate and trigger accuracy
Exchangeable preamplifier
Balanced output
Internal normalizations

10hp, 36mm deep
Maximum current draw:+100mA/–70mA
Reverse power protection


The preamplifier can be exchanged with a different circuit, for example a low impedance, or tube-based preamp. This edition of Sewastopol ships with a universal solid-state preamplifier model “877ЛПМБ”, based on a symmetric JFET input stage and a very low noise operational amplifier. This preamp model is our best effort to achieve very high input impedance and gain while keeping noise at a minimum level. Additional preamp models may be available in the future.

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