u/FlattenApp

[ Removed by Reddit on account of violating the content policy. ]

I play a lot on a JBL Boombox 3 and it always sounded wrong to me. Too much upper-mid, no definition in the low end. I kept fighting it with the channel EQs mid-set, which never actually worked because the problem is the speaker, not the track.

rekordbox has no EQ on the master output and doesn't accept plugins, so there's no way to fix this inside the software. The usual workaround is Audio Hijack, but once you route rekordbox through it you lose headphone cue on your controller, which makes it useless for actually mixing.

So I built the thing I wanted. It sits between rekordbox and your controller, applies a 10-band parametric EQ to the master only, and leaves the headphone path completely untouched. Cue stays dry and adds zero latency. The speaker side adds about 11 ms.

A few things it does that took me a while to get right: the A/B compare is level-matched, so you hear the correction and not a volume jump. The correction never changes your overall loudness, whether the app is in the chain or not. And it survives you unplugging your controller mid-track and plugging it back in.

It's free and I'm not selling anything. I'd like a handful of people to try it on gear that isn't mine, because right now it has only ever run on one Mac with one controller.

Being upfront about what you're signing up for:

- macOS only, and it needs BlackHole (a free audio driver) installed

- macOS will warn you that the developer can't be verified, because I haven't paid Apple's 99 €/year yet. You have to allow it manually in System Settings. If that's a dealbreaker for you, completely fair

- it asks for microphone permission. That's macOS's rule for reading any audio input, even a virtual one. It records nothing and makes no network calls, you can cut your wifi and check

- it's a beta, so don't use it on a gig that matters until you've run it at home

Comment or DM me if you want in.

And whether you want to test or not, I'm curious: what speaker do you usually play on, and does it bother you enough that you'd want to correct it?

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