Efficient tool/method for adding silent center and LFE channels to quad files?


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AudioMuxer will do this under the "Audio Conversion" menu, select "to 5.1 layout (remapping)" under "Remix".

Screenshot 2023-10-23 at 11.03.26 PM.png
From New Receiver Won't Decode 4 Channel Flac Files in Foobar Bit Perfect Mode

Using Sox, in order to add silent c+lfe: sox quad.wav 51.wav remix 1 2 0 0 3 4

where quad.wav: your 4 channel file
51.wav: the resulting 6 channel file
1 2 0 0 3 4: the matrix order of the channels.

The Sox way, since it is based on a Command-line tool, make it easy to do a BIG batch of files and since it is just re-writing the same file it is very fast.