Mix two audio files into one
Voice memo over a backing track, or two takes summed together — per-track gain and optional peak limiting, out as WAV.
Tools used in this guide
The job
Joining puts files end-to-end; mixing puts them on top of each other. For a voiceover over music or a quick two-track blend you want the second kind — each source scaled by its gain, then summed.
Two tracks, two gains
Pick track A and B, set each gain (1.0 = unity, 0.5 = half volume, up to 4×). Keep 'prevent clipping' on — when the sum peaks above full scale, everything scales down together instead of distorting.
Worked example
A quiet backing track at gain 0.5 under a voice memo at 1.0 keeps speech clear; two equally loud tracks at 1.0 each would peak past 100 % — the limiter pulls them both down to fit.
Where it stops
Two tracks only, output is 16-bit WAV at track A's sample rate; a mismatched track B gets a basic linear resample. Each file ≤ 200 MB, combined decoded PCM ≤ 256 MiB. No EQ, no panning, no fades — a sum, not a mixdown desk.