Hi :) I tested something for the Jack dev list.
Using this setup
64 Studio 2.1rc1 upgarded to Lenny
[EMAIL PROTECTED]:~$ uname -r
2.6.21-1-multimedia-amd64
[EMAIL PROTECTED]:~$ jackd -V
jackd version 0.109.2 tmpdir /dev/shm protocol 22
[EMAIL PROTECTED]:~$ qjackctl -v
Warning: no locale found: /usr/share/locale/qjackctl_en_US.qm
Qt: 4.4.0
QjackCtl: 0.3.2
[EMAIL PROTECTED]:~$ hydrogen -v
0.9.3
[EMAIL PROTECTED]:~$ ardour2 -v
Ardour/GTK 2.5
(built using 3525 and GCC version 4.2.4 (Debian 4.2.4-1))
Hydrogen and Ardour synced by jack transport, while frames are set to 128 and
buffer is set to 2, the recordings have no jitter and a negative delay about
5ms.
Using this setup
Suse 11.0
[EMAIL PROTECTED]:~> uname -r
2.6.25.11-0.1-rt
[EMAIL PROTECTED]:~> jackd -V
jackd version 0.109.2 tmpdir /dev/shm protocol 22
[EMAIL PROTECTED]:~> qjackctl -v
Qt: 4.4.0
QjackCtl: 0.3.3
[EMAIL PROTECTED]:~> hydrogen -v
0.9.4-svn84
[EMAIL PROTECTED]:~> ardour2 -v
Ardour/GTK 2.5
(built using 3525 and GCC version 4.3.1 20080507 (prerelease)
[gcc-4_3-branch revision 135036])
Hydrogen and Ardour synced by jack transport, while frames are set to 128 and
buffer is set to 2, the recordings have no jitter and a delay about 0.25ms. I
guess a quarter milli-second delay will be fine, I didn't made acoustic tests,
just looked by Audacity, but this, especially without jitter, should be good
enough. I guess it must be one click, without an early reflection like effect,
and the phasing when playing the audio track and hydrogen unison should be
always the same. Definitive the first beat won't be cut.
So it seems to be that Hydrogen 0.3.2 simply has to be changed by 0.9.4-svn84
to solve this problem.
With frames set to 128 and buffer set to 2 also MIDI jitter seems to be a less
serious problem, but depending to the kind of groove MIDI jitter can become a
problem and if the frames and buffer have to be raised it will be a serious
problem, because there's no headroom for the jitter. I guess if the Jack
transport sync will raise, this won't become a problem, there seems to be
headroom.
Cheers,
Ralf
signature.asc
Description: OpenPGP digital signature
_______________________________________________ 64studio-users mailing list [email protected] http://lists.64studio.com/mailman/listinfo/64studio-users
