There appear clicks in any audiofile I play with Ardour. The clicks appear on different positions each time I play the file.
The sample rate is 44.1 in all: the file, ardour, Jack and audio interface.
The clock source of the audio interface is “internal”.
I run ardour 2.8.16 on Mac OS X 10.9
I use motu mkII828. There is no problem with any other audio program (such as Logic, Max MSP). So I think it must have something to do with ardour or the Jack server. It sounds like something I had when I accidently generated a word clock conflict, but I think I checked all clock settings.
Hm. I restarted the computer (as I already did before) and created a new ardour file. Now it works. Not a very satisfying explanation, I know, but for now the problem seems to be solved.
Thank you very much for your help!
feldforscherin: I’ll be interested to hear whether you continue to be click-free. I have one machine (intended to be my main recording rig, unfortunately) which produces small random clicks, both during recording and playback, without a single (correlated) xrun reported by jack. During some recording sessions the clicks are rare and almost imperceptible, but most of the time it seems like a kind of random “noise field”. I’ve discovered that it gets worse with increases in network traffic, which is interesting since this machine has a PCI network card, and the sound interface is a Delta 66 (also PCI). Swapping the cards had no effect. This is with A3 and pretty conservative jack settings, either from qjackctl or letting Ardour start jack itself. Otherwise I believe this machine’s HW and SW should be up to the task: AMD Athlon II X4 640 CPU @ 3 GHz, 8 GiB RAM, CCRMA low-latency kernel, LXDE, generally lightly loaded…
So here’s hoping that your problems don’t come back, but yeah it sure would be nice to have a root cause, wouldn’t it?