Mark Knecht wrote: > This info is to help me do more debug work on a new HDSP 9652 driver > version that I am helping to test. > > Should the volume levels I hear when using the command > > aplay -Dplughw:0 -r 44100 data/wave/seque~10.wav > > be controlled by alsamixer? Depends on the hardware (or the driver). Many cards have a mixer for certain output streams and/or a master mixer, some don't. (ALSA doesn't modify volume levels in software by default). > Also, on a multichannel card, how do I direct the above aplay command to > a specific channel? I am finding that with this new driver the audio is > appearing on ALL channels on the card, even for a mono wave file. I think > this is a bug, but I'm not sure. The plughw plugin automatically converts sample formats. To access the hardware directly, use "hw:0" instead of "plughw:0", but this won't work if your file isn't exactly in a format supported by the hardware. To access a subset of the channels, you can use the route plugin IIRC. The "documentation" at <http://www.alsa-project.org/alsa-doc/alsa-lib/pcm_plugins.html> lacks the interesting parts, so try to search in the list archives. HTH Clemens
