I wrote:

I suspect that this is a bug in deve_0_36 I have the same problem when I use pd with more than 2 channels on my builtin card 1st channel is silent, 2nd channel plays on both channels.

sorry guenther and others, it might be a jack problem, I get the same results with alsaplayer, I'll update my jack source tree recompile several clients and report my findings tomorrow ...

regards,

x