[LAU] USB2 Audio, PreSonus Audiobox 1818VSL -- was: Sound Devices USBPre2, UAC2 status

[Robin Gareus]

On 01/30/2013 11:44 PM, Fons Adriaensen wrote:
> On Wed, Jan 30, 2013 at 07:14:11PM +0100, Robin Gareus wrote:
> 
>> This works reliably; no x-runs: jackd -d alsa -d hw:2 -r 48000 -p
>> 64 -n 3 jack-delay measures: 403.949 frames    8.416 ms
>> 
>> 
>> Occasional rare x-runs with jackd --sync -d alsa -d hw:2 -r 48000
>> -p 64 -n 2 roundtrip latency: 274.945 frames    5.728 ms
> 
> That's odd. The difference should be one period, 64 frames. But it
> is 129 frames.

Note the --sync in the 2nd command. Hence the nominal difference is
2*64 frames.  "--sync [..identical..] -n 2"  vs  "[..identical..] -n 3"

ciao,
robin