Advice for audio recording

Hans Petter Selasky hps at
Fri Oct 20 16:24:44 UTC 2017

On 10/20/17 17:37, Michael Reifenberger wrote:
> (Hmm, why dev.pcm.4.rec.vchanformat: s16le:2.0 , shouldn't it be 
> s24le:2.0?)


You should override this into s24le:2.0 - yes. Further you should set 
bitperfect to avoid resampling issues and the software volume control. 
The DSP device will then refuse to open in any other ways than what is 
printed in dmesg, with regards to sampling rate and sample size and 

In 11- and 12- you can simply put dev.pcm.4.rec.vchanformat=xxx in the 
kernel environment (man kenv) or in /boot/loader.conf (requires reboot) 
and these settings will be programmed automatically for pcm #4 every 
time you plug this device.

At home I'm using:

Which I'm very happy with. It works well with FreeBSD and is controlled 
via a wireless pad (iOS or Android at your choice).


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