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Hi all,I'm Dave, founder of RoEx. We've just made Automix Desktop available to download recently and I wanted to introduce it here properly.
What it is
Automix Desktop is a standalone app that takes your multitrack stems and produces a mix and master. You drag in your tracks, it processes them locally on your machine, and you get a balanced mix with per-track level, panning, EQ, and dynamics. Nothing is uploaded anywhere. All the processing happens on your CPU.
It also has a built-in A/B player so you can flip between your original stems and the processed mix in real time, and per-stem adjustment controls if you want to push things in a different direction after the initial mix. On the Pro tier there's also reference track mastering, mix reports, audio cleanup, and the ability to export your mix as an Ableton Live Project (.als), so you can open it straight in Live and keep working from where Automix left off.
How it works (the short version)
This isn't an LLM wrapper or a prompt-based tool. The engine underneath, TonnSDK, is a signal-processing and machine learning system that grew out of my PhD work at Queen Mary University of London's Centre for Digital Music, supervised by Prof. Josh Reiss (LANDR Co-Founder). The core approach uses ML models trained on professional mixing decisions to evaluate interactions between tracks and optimise level, spectral, and spatial balance across the mix. Think of it more like an algorithmic mixing assistant than a generative AI tool.
We've been building and refining this for four years and have processed over 7 million tracks through the technology across our various products. This was originally a web service.
What's available
The free tier gives you the full mixing and mastering engine with watermarked exports. No trial period, no track limit. Create a free account, download, and use it. The idea is that you can hear exactly what it does with your own music before deciding whether it's useful to you.
Pro (£19.99/month) removes the watermark and adds reference track mastering, mix reports, audio cleanup, and Ableton Live Project export.
Platform support
- macOS: Intel and Apple Silicon (native)
- Windows: x64
Honest feedback. This is a tool that's meant to sit alongside your DAW, not replace your mixing workflow. It's useful for rough mixes, demo polishing, getting a starting point when you're staring at 30 unmixed stems, or just hearing what a different set of mixing decisions sounds like on your tracks. It's not trying to replace a mixing engineer on a record that matters, and I'd rather be upfront about that than oversell it.
I'll be checking this thread and happy to answer any questions about the technology, the approach, or the product.
Links
- Download: https://www.roexaudio.com/automix-desktop (https://www.roexaudio.com/automix-desktop)
- KVR product page: https://www.kvraudio.com/product/automi ... op-by-roex
- Audio examples: https://automix.roexaudio.com/ (https://automix.roexaudio.com/)
Dave