[linux-audio-user] multichannel Audacity testing

We've done our first night of testing with the Delta 1010, with mixed results. The hardware is: Asus P4PE motherboard (Intel 845 chipset) Pentium IV 2.4B (2.4GHz, 533MHz FSB) Seagate Barracuda IV 80GB M-Audio Delta 1010 (IRQ 9) Matrox G550 Dual DVI (IRQ 10) SB Live (IRQ 11, for soundfonts in hardware with external MIDI keyboard) All other hardware disabled in BIOS (USB, serial ports, parallel port, onboard sound etc) except for Broadcom onboard LAN sharing IRQ 9 - configured, but disabled for recording session with: ifconfig eth0 down cat /proc/interrupts now shows only Delta 1010 on IRQ 9 Software: Linux Mandrake 9.1 upgraded from 9.0 Multimedia patched 2.4.21-pre kernel ReiserFS filesystem on / and /home ALSA upgraded to 0.92 with Cooker RPMs envy24control compiled from alsa-tools 0.93 tarball wxGTK 2.40 compiled from tarball Audacity 1.1.3 compiled from tarball With the Delta 1010 and two input tracks selected in the Preferences, it all works fine. Four input tracks also works. Select eight input tracks and it works fine initially, but after a while something weird happens to the recorded input - I've never seen this behaviour with Audacity in any other context. Suddenly the waveform is drawn as a rapid series of the same shape. Playing the track back, it sounds as it looks: da-da-da-da-da-da-da-da-da-da-da-da-da-da-da-da-da-da-da-da-da-da-da-da-da- Can anyone replicate this bug, if it is a bug? With full duplex enabled, it was even more flaky. I did compile Audacity before the upgrade to Mandrake 9.1, so this may be related. On another computer with just a normal two-channel soundcard, Audacity can dummy 'record' eight channels in full duplex without problems, but then it isn't actually doing much work. Next, we're going to try Thac's RPMs of Audacity 1.1.3 and at least one other multichannel recorder app to see if this is my lack of compilation skills, a system problem or an Audacity problem. Cheers Daniel