Greetings, Long-time Linux user, and relatively new JACK user here. I have built some audio workstations for the community radio station where I volunteer (WDRT, Viroqua, WI, US). I recently switched one of the workstations to use JACK, along with PulseAudio. We use Audacity to edit audio and we have noticed that the "left" and "right" channels are out of sync with each other. We have witnessed the "skew" to be as few as two samples (which is unnoticeable to the ear) to as many as a couple hundred samples (which sounds a lot like a phase error). We performed a lot of troubleshooting, including swapping PCI audio cards (ESI Juli@, Digigram VX222), disabling JACK, running Audacity on the same hardware booted from a USB stick and a completely different Debian environment. I am not *completely* confident, but the likely culprit seems to be JACK. We have recorded audio using jack-record and experienced the same left-right channel skew. Can anyone help point to JACK or OS configuration parameters that we might look at to get our left and right channels in sync? Details: OS: Debian Jessie (8.6), up to date (kernel: 3.16.0-4-amd64 #1 SMP Debian 3.16.36-1+deb8u2 (2016-10-19) x86_64 GNU/Linux) JACK (jackd2): 1.9.10+20140719git3eb0ae6a~df PulseAudio: 5.0-13 ALSA: 1.0.27+1 CPU: Intel(R) Core(TM) i5-2400 CPU @ 3.10GHz RAM: 8GB Audio Cards: ESI Juli@ PCI, Digigram VX222HR PCI Thanks for your consideration! ~David Klann
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