audacity can export multichannel wave files. in fact, it allows to export files with no less than 64 channels.
however, multichannel export is deactivated by default
in audacity. to activate it
- enter the "edit" menu
- click "preferences"
- choose "import / export"
and there you find the option
"when exporting audio tracks to an audio file:Use custom mix (for example to export a 5.1 multichannel file)
it's set to "always mix all tracks down to stereo or mono channel(s)" by default.
once you're done with this audacity will always show you a channel routing window when you export a .wav file. you can connect tracks (left hand side) to output file channels (right hand side). be aware: if you connect more than one track to a channel, those tracks will be mixed (summed), so clipping might occur. panning is, unfortunately, not possible.
also audacity does not permit to audit multichannel - playback is only stereo
. always. real bummer!
HOWEVER, you can choose for each track in your editor window if it shall be handled as mono, left or right, by selecting from the channel's drop down menu. (click the audio track name)
mono will be played back on L and R, whereas L and R are played back only on the respective channel.
audacity does not serve all your needs, but it comes for free.