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Retromulator by DiscoDSP LLC (Released)
https://apps.apple.com/app/id6764767449
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
Details:
Universal: Yes
Minimum OS version: 14.0
Comments
Website worth a read
https://www.discodsp.com/retromulator/
Example:
"The DSP-based hardware cores require the original ROM firmware to operate. You must own the original hardware. Firmware can be obtained directly from the manufacturer using the links provided below."
Can’t wait to hear some demos, see how it stacks up to all that UsualSuspects stuff on desktop
https://bedroomproducersblog.com/2026/03/10/discodsp-retromulator/
Do some parts of this not need ROMs and so aren’t using the 56k interpreter? I.E. DX7 and S1000?
Sounds pretty CPU intensive
That too, at least they point that out very clearly in the blurb. 'Limited polyphony, not for low buffer live performance' etc
The website linked above answers this, the S1000 mode doesn’t need a ROM, same for the OPL3 and Wurlitzer. The DX7 does need a ROM file.
Some interesting discussion of controversy around this release here, including in the comments, as usual:
As a microQ owner , I hope this thread isn’t closed over ROM discussion legality concerns .
Has anyone tried it?
I have the roms, but not sure it’s worth it
I took a chance:
+ It sounds great
- Drop offs from processing
- No parameter editing
- Preset machine
Requesting a refund…
Thanks Mike.
+1
Exactly what I expected from past history . The hardest of hard passes from me
Do you think everyone will get their $5 back when this is banned from the app store?
On desktop it's morally questionable. On iOS it violates several rules. I'm not the app store police, but someone will prob turn them in.
Useful to know, thnx Matt
I’m not involved with DiscoDSP in any way, or this project. But I have independently attempted to adapt this code over to work on iOS for my own personal use, and the JIT compilation system caused a ton of problems. If they’ve actually solved that problem then this is worth the $5. It requires more than just slapping the open source code from The Usual Suspects into an XCode project.
That said, if they ripped out the JIT compiler without some other mechanism for keeping it fast then yeah, this is going to have performance problems.
I’m not sure what legal problems people are referring to here. The code from The Usual Suspects is published under the GPL, and DiscoDSP has also released Retromulator under the GPL. That means they’re compliant with the license.
EDIT: While I see the source for the desktop version on Github, I don’t see the AUv3 build target. This doesn’t make sense. Will continue to investigate.
I’m surprised it passed. I guess it depends on the validation process.
FWIW, the iOS purchase also works on an M series Mac. I have the TUS plugins, and this seems a decent preset machine to run alongside the full fat versions. Unsure if it runs with JIT on the Mac, however.
I am also happier to pay DiscoDSP £5 than £25 for the separate desktop purchase, although I may spring for the latter if I find I’m using it a lot.
I’m assuming you can create new preset banks on the TUS versions and then import them into the Retromulator to access on the iPad?
That’s also my assumption, but I’ve not yet had the opportunity to test. One of the reasons for my purchase was to design patches on the Mac and then import them to Retromulator on the iPad, and I didn’t catch anything in the literature that suggested this wasn’t possible (eg VirusABC “The chip-level emulation runs the same firmware, so factory and user banks play back correctly”).
Yeah, tried it on Mac. I already have all the Usual Suspects emulations running. Was totally puzzled that it was just a preset player with no editing ????
Good question 😱
It appears so, I will test it!
Me too, I thought loading a ROM would give me parameters, no dice. The dark space between the menu and keyboard makes me think perhaps parameters might come with an update, but this release seems half baked.
So they did it! I guess it’s just as legal as the retro game apps released in recent years. But it certainly isn’t light on the cpu 😅 My iPad Air M3 is getting very hot and at max a few notes polyphony. I’m not seeing the JP8000 in the list…
Just a few notes? Wow 😂😂
🤣