M2DX

M2DX is a 6-operator, 32-algorithm FM synthesizer for iPhone, built from the ground up in pure Swift 6. Open it and play immediately — tap the built-in on-screen keyboard and start making sound with M2DX's own hand-crafted presets. No external hardware or MIDI controller is required.

The FM engine is a bit-exact port of the open-source Dexed / msfa DSP, verified sample-for-sample against the reference. It is also compatible with the classic DX7 patch format: bring your own DX7-format .syx banks and play them alongside M2DX's originals.

KEY FEATURES

- Built-in on-screen keyboard with velocity and octave control — play standalone, no hardware needed

- 6-operator, 32-algorithm DX7-style FM synthesis

- M2DX's own original FM presets, plus DX7-format .syx bank import (bring your own)

- A 6-stage FX chain: EQ, Drive, Chorus, Reverb, Stereo, Maximizer

- Low-latency audio with AVAudioSourceNode direct rendering

- AUv3 plug-in — use M2DX as an Audio Unit (AUv3) in compatible hosts

OPTIONAL MIDI (not required to use the app)

- Connect any MIDI controller over Bluetooth or USB if you have one

- Native MIDI 2.0 — UMP with 16-bit velocity and 32-bit controllers

- MIDI-CI Property Exchange — patch names appear on compatible controllers (for example, KORG KeyStage)

- MIDI Learn for hands-on control

MIDI 2.0 done natively, classic FM done faithfully.

The FM engine is built on Dexed / msfa (Apache License 2.0).

M2DX is an independent product and is not affiliated with, endorsed by, or sponsored by Yamaha Corporation. DX7 and Yamaha are trademarks of Yamaha Corporation.

iOS 18 or later.