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I need to downmix from stereo to mono (my system only has one speaker) on a raspberry pi running runeaudio. I tried to apply the solution here Force downmix to mono on Linux but it does not work in my situation.

speaker-test gives following error. Can you tell me what's wrong?

speaker-test -Dmakemono -c2 -t wav

speaker-test 1.1.0

Playback device is makemono Stream parameters are 48000Hz, S16_LE, 2 channels WAV file(s) Broken configuration for playback: no configurations available: Invalid argument Setting of hwparams failed: Invalid argument

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This looks as if your hardware does not support mono playback.

To downmix to both channels, try something like this:

pcm.makemono {
    type route
    slave.pcm "hw:0"
    ttable {
        0.0 1
        0.1 1
        1.0 1
        1.1 1
    }
}

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