[alsa-devel] Changing volume of a single PCM channel

Hi,

how do I change the volume of single PCM channel with ALSA? I'm playing multiple sounds at the same time by opening a new channel for every sound using snd_pcm_open() and let PulseAudio do the mixing. Now assuming that I have allocated four channels using snd_pcm_open()... now I'd like to change the volume of the second channel, the other three channels' volume should not be affected. How can I do this?

AFAICS, volume control is provided by the ALSA mixer interface but I don't seem to figure out how to connect the mixer with my PCM channels opened using snd_pcm_open().

Thanks for any help,

Andreas