Hi, I'm developing an audio capture program for the RME Hammerfall, but I always get a lot of xruns even with big buffer size. my kernel version is 2.6.5-7.104-smp, alsa version is 1.0.3 and JACK is 0.94.0 I have activated alsa tracing in /var/log/messages and I always get the same report: ALSA sound/core/pcm_lib.c:169: XRUN: pcmC0D0c Call Trace: [__crc_vc_cons_allocated+861088/1876935] snd_pcm_period_elapsed+0x3d4/0x440 [snd_pcm] [<faf4c3d4>] snd_pcm_period_elapsed+0x3d4/0x440 [snd_pcm] [__crc_vc_cons_allocated+1028019/1876935] snd_hdsp_interrupt+0x177/0x180 [snd_hdsp] [<faf74fe7>] snd_hdsp_interrupt+0x177/0x180 [snd_hdsp] [handle_IRQ_event+47/96] handle_IRQ_event+0x2f/0x60 [do_IRQ+167/496] do_IRQ+0xa7/0x1f0 [common_interrupt+24/32] common_interrupt+0x18/0x20 [default_idle+0/64] default_idle+0x0/0x40 [default_idle+41/64] default_idle+0x29/0x40 [cpu_idle+36/80] cpu_idle+0x24/0x50 [start_kernel+842/976] start_kernel+0x34a/0x3d0 [unknown_bootoption+0/400] unknown_bootoption+0x0/0x190 [<c03ee100>] unknown_bootoption+0x0/0x190 it would be greatly appreciated if you could give me some advise. Thank you very much for your help. Carlos