Sven-Hendrik Haase wrote:
> I just want to increase the buffer size but apparently dmix
> is the only plugin capable of doing just that.

Only dmix supports the buffer_size parameter.
(And dmix works only with a "hw" device as slave.)

Other plugins should support the buffer_time parameter.  Try this:

pcm.upmix71 {
        type upmix
        slave {
                pcm "surround71"
                buffer_time 682667     # 32768 samples at 48 kHz, in µs
        }
        channels 8
}


Regards,
Clemens

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