A manufacturer of modular synthesis equipment in the Eurorack format, based in France. Mutable's product lineup is notable for its digital sound sources and modifiers, its lineup includes wavetable and physical modelling oscillators. Some of the firmware for its digital modules is available as open source, and Mutable publishes several open source libraries for some common DSP modules.
Mutable Instruments ceased doing business at the end of 2022. Most of the design information and firmware is available on Github here. Manuals and other documentation are here.