Before:
```
FreeBSD Audio Driver (64bit 2009061500/amd64)
Installed devices:
pcm0: <Focusrite Scarlett Solo USB> on uaudio0 (1p:1v/1r:1v) default
snddev flags=0x2e6<AUTOVCHAN,SOFTPCMVOL,BUSY,MPSAFE,REGISTERED,VPC>
[pcm0:play:dsp0.p0]: spd 48000, fmt 0x00200010/0x00201000, flags 0x00002100, 0x00000006
interrupts 1781, underruns 0, feed 1780, ready 0 [b:3072/1536/2|bs:2048/1024/2]
channel flags=0x2100<BUSY,HAS_VCHAN>
{userland} -> feeder_mixer(0x00200010) -> feeder_format(0x00200010 -> 0x00201000) -> {hardware}
pcm0:play:dsp0.p0[pcm0:virtual:dsp0.vp0]: spd 48000, fmt 0x00201000/0x00200010, flags 0x10000000, 0x00000023
interrupts 0, underruns 0, feed 0, ready 0 [b:0/0/0|bs:16384/2048/8]
channel flags=0x10000000<VIRTUAL>
{userland} -> feeder_root(0x00201000) -> feeder_format(0x00201000 -> 0x00200010) -> feeder_volume(0x00200010) -> {hardware}
[pcm0:record:dsp0.r0]: spd 48000, fmt 0x00200010/0x00201000, flags 0x00002100, 0x00000007
interrupts 0, overruns 0, feed 0, hfree 3072, sfree 2048 [b:3072/1536/2|bs:2048/1024/2]
channel flags=0x2100<BUSY,HAS_VCHAN>
{hardware} -> feeder_root(0x00201000) -> feeder_format(0x00201000 -> 0x00200010) -> feeder_mixer(0x00200010) -> {userland}
pcm0:record:dsp0.r0[pcm0:virtual:dsp0.vr0]: spd 8000, fmt 0x00100008, flags 0x10000000, 0x00000000
interrupts 0, overruns 0, feed 0, hfree 0, sfree 0 [b:0/0/0|bs:0/0/0]
channel flags=0x10000000<VIRTUAL>
{hardware} -> feeder_root(0x00000000) -> {userland}
No devices installed from userspace.
```
After:
```
FreeBSD Audio Driver (64bit 2009061500/amd64)
Installed devices:
pcm0: <Focusrite Scarlett Solo USB> on uaudio0 (play/rec) (default)
snddev flags=0x2e6<AUTOVCHAN,SOFTPCMVOL,BUSY,MPSAFE,REGISTERED,VPC>
playback channels=[hardware=1, virtual=1]
recording channels=[hardware=1, virtual=1]
pcm0:play:dsp0.p0
channel flags=0x2108<TRIGGERED,BUSY,HAS_VCHAN>
rate=48000
format=s16le:2.0/s32le:2.0
interrupts=167,
underruns=0
feed=166
ready=0
hardware buffer=[size=3072, blocksize=1536, blockcount=2]
software buffer=[size=2048, blocksize=1024, blockcount=2]
feeder flags=0x6<FORMAT,MIXER>
feeder chain=[userland -> feeder_mixer(0x00200010) -> feeder_format(s16le:2.0 -> s32le:2.0) -> hardware]
pcm0:virtual:dsp0.vp0
parent channel=pcm0:play:dsp0.p0
channel flags=0x1000010c<RUNNING,TRIGGERED,BUSY,VIRTUAL>
rate=48000
format=s32le:2.0/s16le:2.0
pid=818 (mpv)
interrupts=0,
underruns=0
feed=1494
ready=14848
hardware buffer=[size=0, blocksize=0, blockcount=0]
software buffer=[size=16384, blocksize=2048, blockcount=8]
feeder flags=0x23<ROOT,FORMAT,VOLUME>
feeder chain=[userland -> feeder_root(0x00201000) -> feeder_format(s32le:2.0 -> s16le:2.0) -> feeder_volume(0x00200010) -> hardware]
pcm0:record:dsp0.r0
channel flags=0x2100<BUSY,HAS_VCHAN>
rate=48000
format=s16le:2.0/s32le:2.0
interrupts=0,
overruns=0
feed=0
hfree=3072
sfree=2048
hardware buffer=[size=3072, blocksize=1536, blockcount=2]
software buffer=[size=2048, blocksize=1024, blockcount=2]
feeder flags=0x7<ROOT,FORMAT,MIXER>
feeder chain=[hardware -> feeder_root(0x00201000) -> feeder_format(s32le:2.0 -> s16le:2.0) -> feeder_mixer(0x00200010) -> userland]
pcm0:virtual:dsp0.vr0
parent channel=pcm0:record:dsp0.r0
channel flags=0x10000000<VIRTUAL>
rate=8000
format=u8:1.0
interrupts=0,
overruns=0
feed=0
hfree=0
sfree=0
hardware buffer=[size=0, blocksize=0, blockcount=0]
software buffer=[size=0, blocksize=0, blockcount=0]
feeder flags=0x0
feeder chain=[hardware -> feeder_root(0x00000000) -> userland]
No devices installed from userspace.
```