From: Pieter P. <pi...@jo...> - 2007-07-24 09:05:26
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Mark Jones wrote: > Thanks for the help with the Presonus Firepods. > > After this week, I'll try some of the other suggestions that involve recompiling freebob and > libiec61883 but I got it working thanks to your help. > > To test my setup, I use a metronome that feeds 7 splitters to give me a 1 -> 8 signal split. Then > I record that and use audacity and a very tight zoom in to see how well the channels are in sync. > With 3 units, the sync is normally 2 samples or less apart (.04ms out of sync). With 4 unit > setup, the timing is off by 11 samples. (.23 ms out of sync). I'm going to leave it recording all > night and check it again in the am to make sure it doesn't drift with time, but so far its never > done that. > > Here is the setup > > /usr/bin/jackd -dfreebob -r48000 -p512 -n5 -C -o0 > > 4 daisy chained Presonus Firepods connected to the firewire connector on the back of an ASUS > P5B-VM Motherboard with 1.86GHz Core 2 Duo, 2GB ram, ubuntustudio > > Jack version .103 (instead of the .102 that comes with ubuntustudio, however this might not be > necessary) > > The key to getting it to run is the -C option which removes the output channels. Since I don't > need them, I chose to leave them out. > > It's amazing how you guys answered the question faster than Presonus did about how to sync up the > units using a word clock on S/PDIF Would you mind taking the time to write some documentation regarding your setup for ffado.org? Thanks, Pieter |