Retromulator is a multi-core retro hardware emulation app and AUv3 plug-in that brings legendary synthesizer, sampler, and keyboard cores back to life through authentic low-level emulation

Each core runs its actual firmware, physical model, or sample data — delivering the unmistakable character of the hardware that defined electronic music from the early 80s through the 2000s.

EMULATED CORES

Virtual Analog Synths (Motorola DSP 56300 recreation, interpreter mode) — built on the open-source Gearmulator by the dsp56300 team:

DISCLAIMER: Apple's iOS App Store does not allow Just-In-Time (JIT) code generation in third-party apps

As a result, the DSP 56300 cores run in pure interpreter mode, which is significantly slower than the desktop JIT version

Expect higher CPU usage, reduced polyphony, and limited multitimbral capability compared to the desktop edition

A modern device (A14 / M1 or newer) is recommended for the DSP-based cores

Even on an M1 / A16-class chip, a high audio buffer size (high-latency setting) is required and polyphony remains very limited — these cores are not intended for low-latency live performance on iOS.

Access Virus A, B and C

Access Virus TI / TI2 / Snow

Clavia Nord Lead 2X

Roland JP-8000

Waldorf microQ

Waldorf Microwave XT

FM Synthesis:

Yamaha DX7 — original chip set emulation, based on VDX7 by Charles Chiaccona

Yamaha OPL3 — Nuked OPL3 cycle-accurate FM by Nuke.YKT

Electric Piano and Sampler:

Wurlitzer 200A — OpenWurli physical modelling by hal0zer0 (Rust ported to C++ by discoDSP)

Akai S1000 — SFZero sample engine by Steve Folta, with Bliss Sampler support and resampling engine by discoDSP (SF2 / SFZ / ZBP / ZBB)

KEY FEATURES

Native AUv3 plug-in for AUM, Cubasis, GarageBand, Logic Pro and more

Standalone app for iPhone and iPad

Full MIDI control: CC, mod wheel, expression, pitch bend

8-point sinc interpolation for sample playback

Auto-slice drum mapping and global retuning via MIDI

ROM firmware loading from original hardware

Background audio, iCloud and Files app integration

Optimised JIT-less interpreter compatible with iOS App Store sandbox