Sorry, Arnuld, I am a little bit off topic. You have already answered some questions in another thread. Here are some hints, but probably doesn't help: - the default configuration files are in /usr/share/alsa (installed with alsa-lib port) and are usually sufficient. - I have the following /etc/asound.conf file pcm.!default { type plug slave.pcm "kombinace" } pcm.vystup { type dmix ipc_key 1024 ipc_key_add_uid 1 slave { pcm "hw:0,0" # format S32_LE period_time 0 period_size 1024 buffer_size 8192 rate 44100 } } pcm.dsp0 { type plug slave.pcm "vystup" } pcm.vstup { type dsnoop ipc_key 2048 ipc_key_add_uid 1 slave { pcm "hw:0,0" channels 2 period_size 1024 buffer_size 4096 rate 44100 periods 0 period_time 0 } bindings { 0 0 0 1 } } pcm.kombinace { type asym playback.pcm "vystup" capture.pcm "vstup" } - the simple aplay command works? Pavel.