Thank you all for the help. Here's my results with FA-101. kernel: 2.6.14-gentoo #2 PREEMPT libraw1394: 1.2.0 libiec61883: 1.0.0 libavc1394: SVN freebob: SVN jackd: 0.100.0 from freebob.sf.net jackd -R -d iec61883 -o osc.udp://localhost:31000 -p 64 -b 64 -s 0 -i 8 -t 16 -r 8192 Rare xruns, mostly on client connection/disconnection Interesting observation: Output from jdelay initially shows 1298.7 (samples of input->output delay). That is with 2 buffers of 64 samples! My Delta66 gives 188 samples of delay with this setup. With some xruns the delay increases: 1298.700 1298.702 1298.702 ?? Inv 51034.701 ?? 1314.701 1314.702 1314.701 ... 1314.702 1314.701 1314.699 ?? 59410.705 ?? Inv 1370.702 ?? 1370.702 ?? 1370.701 ... 1370.702 1370.700 1370.700 ?? Inv 17130.702 ?? 1442.700 ?? Inv 1442.701 1442.702 --Dmitry. P.S. After killing jackd and/or freebob, I can restart them without device reset. No problems here.