[Belansky]

Да, надо было не вопить о помощи в пустыне, а сразу написать разработчику драйвера...
Вот, что он написал в ответ. Переводить, думаю, не требуется и так все понятно.
hello Stanislav,

the snd_envy24ht(4) that comes with FreeBSD 7.0-RELEASE and the
version that is in current FreeBSD CVS repository both have a bug in
the M-Audio Revolution 5.1 and M-Audio Revolution 7.1 initialization
data.

that bug is fixed long time ago and the latest snd_envy24ht(4) and
spi_spicds(4) code is here:

http://xkodi.svobodno.com/latest/envy24ht/
http://xkodi.svobodno.com/latest/spicds/

so, please, get the latest code, that really works with M-Audio
Revolution 5.1/7.1 and build it:

01) fetch http://xkodi.svobodno.com/latest/envy24ht/envy24ht.c
02) mv envy24ht.c /usr/src/sys/dev/sound/pci
03) fetch http://xkodi.svobodno.com/latest/envy24ht/envy24ht.h
04) mv envy24ht.h /usr/src/sys/dev/sound/pci
05) fetch http://xkodi.svobodno.com/latest/envy24ht/Makefile
06) mv Makefile /usr/src/sys/modules/sound/driver/envy24ht

07) fetch http://xkodi.svobodno.com/latest/spicds/spicds.c
08) mv spicds.c /usr/src/sys/dev/sound/pci
09) fetch http://xkodi.svobodno.com/latest/spicds/spicds.h
10) mv spicds.h /usr/src/sys/dev/sound/pci
11) fetch http://xkodi.svobodno.com/latest/spicds/Makefile
12) mv Makefile /usr/src/sys/modules/sound/driver/spicds

13) cd /usr/src/sys/modules/sound/driver/envy24ht
14) make clean
15) make
16) make install

17) cd /usr/src/sys/modules/sound/driver/spicds
18) make clean
19) make
20) make install

21) kldload snd_spicds
22) kldload snd_envy24ht

at the moment recording is not supported, only playback is supported.
if you have any further questions or problems i'm ready to help, just mail me.


best wishes,
konstantin