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Subject: Re: sound card config
To: Alexandru Goia <alexandrugoia9@gmail.com>
Cc: freebsd-multimedia@freebsd.org
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From: Hans Petter Selasky <hps@selasky.org>
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Date: Wed, 12 Sep 2018 09:13:10 +0200
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On 9/12/18 2:04 AM, Alexandru Goia wrote:
> pcm0: <Analog Devices AD1884 (Rear Analog)> at nid 18 and 21 on hdaa0
> pcm1: <Analog Devices AD1884 (Front Analog)> at nid 17 and 20 on hdaa0

Did you try:

sysctl hw.snd.default_unit= 0 or 1

Before starting playback?

--HPS