Most services that call themselves AI mixing take one finished stereo file and master it. Bandmixr mixes your separate stems first and then masters the result, and RoEx Automix is one of the few others that starts from stems too. On paper they promise the same finished song.
We make Bandmixr, so read this knowing that. Then run your own stems through it: the first mix and the first download are free.
Built for the recordings people actually make
RoEx's upload guidance is written for producers exporting stems from a DAW: 16-bit WAV, one file per instrument, and a workflow that assumes you already know which stem matters most.
Bandmixr is built for those stems and for the messier recordings most people actually have. A finished beat or backing track next to your vocal is recognized and passed through untouched, so the vocal gets mixed around it instead of the beat getting reprocessed. A doubled vocal stays one voice. Two mics on one piano are treated as one instrument, not two competing ones. A drum kit with bleed in every mic is mixed as a kit. A phone recorder that saved mono as fake stereo is caught and handled. None of that needs a setting, because the engine listens to the audio instead of asking you to describe it. How to Mix Vocals Over a Beat You Bought and How to Mix a Song You Produced in Logic, FL Studio or Ableton Without Learning to Mix walk through the two most common cases.
Free tools that keep your audio on your computer
Before the mix comes the recording. Bandmixr's free Rehearsal Cutter splits a two-hour band practice or gig recording into separate songs in your browser, with nothing uploaded and no account. RoEx has no equivalent.
Bandmixr's free Mix Analyzer measures loudness, true peak, clipping, stereo image and tonal balance on your own machine, again with no upload and no signup. RoEx's Mix Check Studio analyzes a mix too, but your file goes to their servers first.
Your music stays yours
Bandmixr will never train AI on your music, RoEx says it does not train on uploads either.
Which one for which person
Pick RoEx Automix if you need one of three narrow things: the mix back as an editable session in Ableton Live, Bitwig or Fender Studio, a mixing engine behind an API for an app you are building, or a desktop app, which RoEx offers as an early beta for Pro subscribers. Bandmixr's Pro plan exports the processed stems as plain audio, which opens in every DAW.
Pick Bandmixr if you want to upload what you recorded and get a mix that already sounds like your genre, whether that is a vocal over a bought beat, a rehearsal room full of bleed, or clean stems out of Logic. Pick it if you would rather fix a finished mix in a mixer that every plan includes than fill in settings before one exists, and if you want the cutter and the analyzer free in the same place. Bandmixr vs Cryo Mix and Bandmixr vs LANDR cover the other two common comparisons, and The Best AI Mixing and Mastering Services Compared puts the whole field side by side.
Try it on your own stems
Upload your stems to bandmixr.com, confirm the labels, pick your genre and listen to the first mix against your rough bounce at the same volume. Anything you would change, you change in the mixer. The first download is free.