linuxaudio.org

On Wed, 2012-03-14 at 12:40 -0400, Paul Davis wrote:

quoted text
> On Wed, Mar 14, 2012 at 12:32 PM, Ralf Mardorf

>  wrote:

>

> > IIRC it was in April 2011 Jack2 1.9.8 from svn. Here hw jitter is close

> > to zero.

>

> then your definition of jitter is very different from mine.

Perhaps just good luck. For my old Envy24 sound card MIDI jitter

correlated to the latency. The more latency, the more positive and

negative drift I got for audio recorded MIDI events from hw synth.

I never made MIDI recordings since I own a RME card.
FWIW ALSA MIDI sequencer timer was hrtimer and tickless was enabled by

the kernel. It's also said that tickless should be bad and I experienced

it vice versa.
For soft synth I never noticed serious issues, at least not for my

production Linux, even if I used 'seq' instead of a2jmidid.
FWIW mobo ASUS M2A-VM HDMI, without the HDMI thingy , but instead a

GeForce 7200 GS. AMD Athlon dual-core BE-2350. Sound card TerraTec EWX

24/96, PCI. I won't refer to ascertained measurement results, they might

be wrong, but others and I heard "improper timing" before and steady

timing when using -Xalsarawmidi.
- Ralf
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