M1R Music Workstation © 1988 Korg.
The Korg M1R Music Workstation was the rackmount version of the legendary M1 workstation, designed for studio and MIDI production environments. Developed by Korg, it used the same AI Synthesis PCM-based engine as the keyboard M1, featuring 16-voice polyphony, 8-part multitimbrality, dual digital effects processors, and full compatibility with M1 programs and sequences. The M1R was widely used as a compact sound module in early 1990s MIDI studios.
The M1R is a rackmount equivalent of the original Korg M1, sharing the same synthesis engine and sound architecture.
It uses 4 MB of 16-bit PCM waveform ROM, identical in character to the M1 workstation generation.
The unit supports 16-voice polyphony and 8-part multitimbrality, making it suitable for full MIDI sequencing setups.
It includes dual multi-effects processors, contributing heavily to the characteristic polished “M1 sound” used in late-80s and early-90s music.
The M1R is fully compatible with M1 sound programs and combinations, allowing direct patch interchange via MIDI SysEx or cards.
Depending on configuration, memory can be reallocated between program storage and sequencer memory, affecting internal capacity (a common M1-family trait).
It was widely used in pop, house, techno, and film/TV scoring due to its reliability and consistent MIDI integration.
Unlike the M1 keyboard version, the M1R was often used as a studio expander module, paired with external sequencers and controllers.
The M1R helped establish the concept of rackmount “workstation modules” in early 1990s MIDI production setups.
The “EX” variants (M1R EX / M1 EX) are expanded ROM revisions, but the base M1R is the original rack implementation of the platform.