Audio channel router
Remap, swap, duplicate or split the channels of a recording, using simple routing lines such as out1 = in2.
Accepted files: .wav,.mp3,.m4a,.aac,.flac,.ogg,.oga,.opus,.webm,audio/*. Choose one file. Up to 256 MiB in total.
One recording up to 256 MiB, 10 minutes and 8 channels; routing text up to 10,000 characters and 8 output lines. WAV is read with every sample intact; other formats are decoded by your browser at 48 kHz. Everything is processed on your device and nothing is uploaded. Download: WAV, or a ZIP of mono WAV files in split mode, and a JSON report. One output per line, for example out2 = 0.5*in1 + 0.5*in2. Up to 10,000 characters. Review the settings before running.
Your result
How to use Audio channel router
- Choose the recording whose channels you want to change.
- Pick a mode: matrix, split, swap or duplicate.
- In matrix mode, write one routing line per output channel, such as out2 = 0.5*in1 + 0.5*in2.
- Route the channels and download the WAV, or the ZIP of single-channel files in split mode.
Useful next steps
Routing lines
Each line defines one output channel, numbered from 1 in order: out1 = in2 copies input channel 2 to output 1. Terms can be added or subtracted and scaled by a number up to 4, as in out3 = 0.5*in1 - 0.5*in2. Lines starting with # are ignored. At most 8 output channels.
Other modes
Split writes each channel as its own mono WAV inside a ZIP file. Swap exchanges left and right of a stereo file. Duplicate turns a mono file into stereo with the same signal on both sides. Routing lines are only read in matrix mode.
Exact copies
A channel that is copied without scaling keeps every sample. With the sample format set to match, a 16-bit or 24-bit source is written in its own format, so copied channels are bit for bit identical. Mixed channels can go above full scale and are then clipped in 16-bit and 24-bit files, so keep the sizes of the coefficients on each line adding up to 1 or less.