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Building a browser mashup maker: stem split, tempo stretch, key shift and drum alignment in Web Audio

This story is from 2026-10-22. It is preserved in the archive; the latest stories are on the live feed.

I build SongUp AI . This is the story of rebuilding one of its free tools, the Mashup Creator , and what I learned doing it. The bug report was one word: "quality" Our first mashup tool was really a DJ crossfader. Song A played, then both songs overlapped at full volume for a while, then Song B pla…

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  1. 2026-10-22 13:45 · DEV Community — AI
    Building a browser mashup maker: stem split, tempo stretch, key shift and drum alignment in Web Audio

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