[Bug 252761] multichannel USB audio device reports only 2 channels via SNDCTL_AUDIOINFO

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=252761

--- Comment #4 from Ed Maste <emaste at freebsd.org> ---
Looks like PA OSS only tries up to 16 channels:

https://github.com/PortAudio/portaudio/blob/master/src/hostapi/oss/pa_unix_oss.c#L358

    /* Negotiate for the maximum number of channels for this device.
PLB20010927
     * Consider up to 16 as the upper number of channels.
     * Variable maxNumChannels should contain the actual upper limit after the
call.
     * Thanks to John Lazzaro and Heiko Purnhagen for suggestions.
     */
    maxNumChannels = 0;
    for( numChannels = 1; numChannels <= 16; numChannels++ )
    {

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