How a Browser Mashup Tool Was Rebuilt to Match Vocals to Beats

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SongUp AI, a free browser-based audio tool developer, describes rebuilding its Mashup Creator after an early version simply crossfaded two songs without matching keys, leading a paying user to cancel. The new version separates each track into stems on the user's computer, so audio is not uploaded, and places one song's vocals over another song's instrumental. Key alignment now relies on comparing vocal frames against the beat's chords rather than whole-song key labels, which the developer found more reliable. Timing is aligned by correlating drum stems, with a beat-grid fallback, and the mix gets EQ and limiting for clarity. Phones cannot run the process in-browser, so they use a paid server path with saved pending jobs, and the article notes that published mashups of commercial songs require rights-holder permission.

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ProgrammingDEV Community ·

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