I was capturing some digital video through firewire on Ubuntu 12.04 with Kino and there was no sound. Starting Kino with this comman remmedied the situation.

padsp kino

The error I was receiving was this:

ALSA lib pcm.c:2217:(snd_pcm_open_noupdate) Unknown PCM /dev/dsp
Could not open ALSA device "/dev/dsp": No such file or directory