EM-1@tracelistener
Patch-only Korg EM-1 firmware mod adding MUTE LOCK, MUTE ALL, and persistent per-pattern mute saving, with guarded backup/install/recovery tools. No Korg firmware included.
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1 open-source firmware project for the Korg EM-1, from 1 creator. Most starred: tracelistener-em1-mute-mod.