I've been trying to figure out how to get good multichannel sound with a laptop and hdsp multiface for about a year now. It has been nothing but a headache, but I feel like I'm slowly coming to terms with the card.
The main problem is that the ALSA drivers don't like running at 44.1k or 48k samplerates ( yet these are the most useful.. go figure). 32k works most of the time (but sometimes I have to start the machine, let the firmware load, then reboot before I can get the crackling to go away), but 44.1 and 48 are always crackling and xrunning.
Now here's the wtf, something I didn't try until recently just because I was sure it wouldn't work... 88.2k and 96k samplerates sound great! I still can't get low block blockrates ( 512 is about the smallest I can use ) and realtime mode does nothing but sputter, but at least I get clean sound. However, I want all 8 ins and outs and the higher samplerates limit the channels to 4.
This works consistently using both pd's alsa support and qjackctl connected to whatever.
There has to be some logical explanation for this, anyone know?
rich
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