On Monday, March 05, 2018 11:14:18 AM Rodolfo Medina wrote: > Let's then have a two-channels audio file, let's call it input.wav. Sox > should be told to send channel 1 of input.wav to soundcard 1 and channel 2 > of input.wav to soundcard 2. Having a look at sox manual, I didn't find > anything such... > My suggestion is jack (even though I've never used it)--have you looked at that?