← Audio Sweet
honey butter.
upmixer / downmixer
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tutorials
audio sweet.
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honey butter.
upmixer / downmixer
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Drop an audio file, or click to choose oneTap to load an audio file

Works with MP3, WAV, M4A, OGG, FLAC — whatever your browser can play.

Rendering ISO…
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Channel Levels — Upmix to 5.1
Switch between Upmix (stereo → 5.1)
and Downmix (5.1 → stereo) modes.
Mix Mode
UPMIX
Stereo — ISO up to 2 channels at once, panned to your L/R speakers.
Surround — ISO any/all 6 channels, each to its real 5.1 speaker.
Surround requires a system output device configured for 5.1.
Monitor
STEREO
playing in R speaker
playing in L speaker
ON — Center channel receives the full-range mid signal.
Crossover only applies to LFE.
OFF — Center is highpassed at the crossover frequency,
complementing the LFE lowpass.
Full Scale Center
ON
OFF
Source — the untouched input file (drives playback in Upmix when nothing's soloed).
Target — the processed 5.1 mix as it will export, always shown in meters.
Source Target
L
R
C
LFE
LS
RS