Really Nice Audio

Studio gear, repaired and reimagined.

I’m Matt. I repair classic analog and studio equipment and design electronics and software tools for the studio and bench. Every repair is documented on YouTube, building an open archive of diagnostic and restoration practice for future generations of engineers.

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New · Free tool

Stereo / Mono Checker

Prep your stems before they hit the DAW.

Clean the names. Strip the song title from every file in one go
Lock the order. Drag to sort, auto-number 01_, 02_… for the DAW
Listen properly. Solo any stem in L, R, mono or L−R
Ship it. True-mono conversions, one tidy ZIP

Free. Runs in your browser. Nothing is uploaded.

Try it free

How it works

See the stereo.

Every stem’s L/R spread, at a glance.

Built for every pair of eyes.Colour-blind mode swaps in a colour-blind-safe palette and adds symbols to every status. Flip it and see.That’s colour-blind mode: a colour-blind-safe palette, with symbols on every status. On by default in the app.