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The Ensoniq MR61 is a 61-key music workstation synthesizer that Ensoniq released in 1996. It features a 16-track sequencer, digital effects, and several hundred onboard sounds or patches.

This music workstation got rid of some previous classical Ensoniq features, such as polyphonic aftertouch (replacing it by a mono version) and full sound editability. Its concept of usage was also radically different from previous Ensoniq keyboards, such as the TS-10. The machine's operating system was never finished and has numerous operational and MIDI bugs. However, most of those problems were compensated by an improved 64-note polyphony, high quality 24-bit effects and a quick (but not fully editable) sequencer. The addition of the Idea Pad, which was essentially a MIDI capture buffer, allowed the user to quickly move anything recently played on the MIDI keyboard, including Pitchbend, Mod, and MIDI realtime Controllers, to a track in the sequencer.

While the direct sample loading facilities of the previous TS/ASR models were lost, a rare add-on card, called the MR-Flash, allowed the MR/ZR keyboards to load up to 4 mebibytes of samples into permanent flash ROM, via floppy disk drive. However, no sample library import facilities were offered, so existing ASR/TS owners couldn't use their sample files on the new machine. A drum machine with pro-quality mixable preset patterns, benefitted from the unusually large internal drumsounds library (approx. 700 samples) and was integrated with the sequencer, but it was impossible to create patterns inside the machine.

The effects section runs at full 44.1 kHz quality, unlike the TS engine at 32 kHz. The routing scheme was also simplified from previous machines and sports similarities with Roland's XP machines.

All MR versions could house up to three expansion cards, each one holding up to 24 mebibytes of samples and sound data. That was a first (and last) for Ensoniq products. Three are known: Perfect Piano, Urban Dance Project and World Sounds. The cost about $500 each. A fourth card, the Drums Expansion, was a 2 mebibyte add-on which contained about 700 drum sounds, intended for the rack version (the keyboards have this expansion hardwired internally). A fifth card was the aforementioned flash expansion.

The MR76 was the 76-note weighted keyboard version. The MR-Rack (which actually appeared before the keyboard versions) shared the same architecture and sounds, with the obvious exception of the sequencer and drum machine. Also, while the rack version could take the same wave expansion cards of the keyboard counterparts, it's not compatible with the flash ROM sample-loading add-on.