Roland PRO-E mod: Rosetta OS custom firmware with a Juno mode, arpeggiator, Juno PWM, resonant filter + Juno chorus / delay / lo-fi on its reverb chip, your own long samples, SYNTH EDIT on the panel and styles from MIDI. One app patches your own dumps. Tested on a real PRO-E. No Roland code included.
midi reverse-engineering roland synthesizer chorus custom-firmware juno arranger 68hc11 mt-32 pro-e e-series arpeggiator cm-32l vintage-synth resonant-filter firmware-mod rosetta-os la32 synth-mod
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Updated
Nov 8, 2026 - Python