Just found out that ALSA OSS emulation works in full duplex !

The problems has been , that the OSS emulation code just lies about it's ability to do full duplex when queried.

I removed the line in s_linux, started pd with the old interface (command line: pd -frags 4), and pd is running happily in full duplex on my Hoontech Soundtrack 4Dwave.

Guenter

PS: Miller, if you want to fix that it's the test for DSP_CAP_DUPLEX in oss_open_audio , maybe we should just try to open it in full duplex and look if it fails instead of using the DSP_CAP_DUPLEX flag --