[Ardour-Users] jack sample rate

[John Rigg]

On Tue, Apr 22, 2008 at 07:24:10PM +0100, John Rigg wrote:
> ALSA should definitely _not_ be doing resampling with pro/semi-pro
> hardware like this. It would destroy performance.

This could be the problem. IIRC recent versions of ALSA
use plughw (which uses software resampling) as the default device 
instead of hw:0 like older versions. If this is indeed the case,
the hardware device will have to be specified in the command when
starting jackd, eg.:

jackd -R -d alsa -d hw:0 -r 44100    (assuming your card is hw:0)

Try starting jackd with that on the command line. If it works,
check that qjackctl is using a similar command, ie. with the -d hw:0
(or whatever hw: number your card is) option.

John