Obrigado, AlexBR, pelas dicas.
Executei um lsmod | grep snd_ e o resultado foi este:
snd_emu10k1_synth 8960 0
snd_emux_synth 39296 1 snd_emu10k1_synth
snd_seq_virmidi 8576 1 snd_emux_synth
snd_seq_midi_emul 8192 1 snd_emux_synth
snd_seq_dummy 4996 0
snd_seq_oss 36480 0
snd_seq_midi 9984 0
snd_seq_midi_event 8960 3 snd_seq_virmidi,snd_seq_oss,snd_seq_midi
snd_seq 59120 9 snd_emux_synth,snd_seq_virmidi,snd_seq_midi_emul,snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_seq_midi_event
snd_emu10k1 128288 1 snd_emu10k1_synth
snd_via82xx 30360 1
snd_ac97_codec 97696 2 snd_emu10k1,snd_via82xx
snd_ac97_bus 3456 1 snd_ac97_codec
gameport 17160 4 analog,snd_via82xx,emu10k1_gp
snd_pcm_oss 47360 0
snd_mixer_oss 19584 1 snd_pcm_oss
snd_pcm 84612 4 snd_emu10k1,snd_via82xx,snd_ac97_codec,snd_pcm_oss
snd_util_mem 6016 2 snd_emux_synth,snd_emu10k1
snd_timer 25348 3 snd_seq,snd_emu10k1,snd_pcm
snd_page_alloc 11400 3 snd_emu10k1,snd_via82xx,snd_pcm
snd_mpu401_uart 10240 1 snd_via82xx
snd_hwdep 10756 2 snd_emux_synth,snd_emu10k1
snd_rawmidi 27264 4 snd_seq_virmidi,snd_seq_midi,snd_emu10k1,snd_mpu401_uart
snd_seq_device 9868 8 snd_emu10k1_synth,snd_emux_synth,snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_seq,snd_emu10k1,snd_rawmidi
snd 58372 17 snd_emux_synth,snd_seq_virmidi,snd_seq_oss,snd_seq,snd_emu10k1,snd_via82xx,snd_ac97_codec,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_timer,snd_mpu401_uart,snd_hwdep,snd_rawmidi,snd_seq_device
Só que com isso não sei dizer quais módulos remover e quais recarregar e em que ordem.
Tentei...
rmmod -f snd_emu10k1
rmmod -f snd_via82xx
... mas recebi um "Resource temporarily unavailable" para os dois comandos.
Ficaria muito grato se você pudesse me ajudar nisso.
[]s.