Hi Product Hunt 👋

I'm a music producer in Japan, and I mix vocals for people who post covers. I get more mix requests than I can take, and many singers just want to post their cover without waiting.

So I took the way I mix covers by hand and turned it into a fixed routine. That's KUBOMI. It isn't a generic auto-mix: it goes through the same steps I do when I mix a cover myself. I used AI to help me write that routine as code, but your vocal and backing track never go through an AI model. The mix and master are signal processing.

You upload your vocal and your backing track, and it gives you back a mixed and mastered song.

What it does:

- Tells lead, harmony, double and backing track apart (you can fix it if it's wrong)

- Keeps your singing as it is in the first version. Pitch correction is off until you turn it on

- Lets you change "pieces" (reverb amount, vocal level, pitch correction and more) and rebuild. Earlier versions stay, so you can compare

Who it's for: people who sing covers or their own songs at home and want a mixed track they can post.

What it can't do: it can't fix a recording that is clipped or very noisy, and a mix engineer who works on your song by hand will tailor it in ways an automatic mix can't.

The before/after demos on the page are matched in loudness, so you hear the mix, not just "louder".

You can try 1 song without signing in. I'd love to hear: what would you need to hear before you'd post an automatic mix of your own song?