Oldsun

sandisonUpdated Oct 27, 20260 on GitHub

Firmware Mod
Machine

Oldsun is a Juno-inspired synth for the Teenage Engineering OP-XY, combining a warm oscillator and chorus with the character of a worn cassette. Shared tape movement gives chords a connected sense of pitch drift, flutter and age. Two pages of controls shape the oscillator, chorus and tape behavior, including warped, reversed and degraded textures. The OP-XY’s filter, envelopes, LFO and effects follow the engine, so it can be played and sequenced alongside the instrument’s other machines. Installation uses Open-XY.

License: MIT

Compatible with

OP-XY Synthesizer + SequencerTeenage Engineering

Links

Source Install in browser Play in browser Docs · github.com Docs · github.com

Installing third-party firmware can brick your unit and may void its warranty. Back up first and follow the project's instructions. Read the docs.

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