Using the multi plugin with a device with different number of inputs and outputs

[Francesco Cameli <francesco.cameli95@xxxxxxxxx>]

Hello everyone,

I am struggling to use my Expert Sleepers ES-8 audio interface together with my other interface - a Scarlett 2i2 - with the alsa multi plugin. Considering that the ES-8 has 12 inputs and 16 outputs, I can't seem to directly state the total number of channels as 28, since this would create a device with 28 ins and 28 outs, which is not what the ES-8 provides. While for an interface with the same number of inputs and outputs I can simply set the channels to the shared number, this doesn't work with interfaces with a different number of inputs and outputs.

Is there a way to create a multi device using a different input and output channels number? My .asoundrc currently looks like this:

pcm.multiES8 {
    type multi
    slaves.a.pcm hw:USB   #My other interface with 2ins/2outs

    slaves.a.channels 2

    slaves.b.pcm hw:ES8    #This device has 12ins/16outs
    slaves.b.channels 28     #Any number here fails. I tried 0 to 28.

    ... bindings here ...
}

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