15 Jul
2010
15 Jul
'10
10:41 a.m.
On Thu, 2010-07-15 at 08:26 +0200, Clemens Ladisch wrote:
Ralf Mardorf wrote:
I'll test this :).
On Thu, 2010-07-15 at 09:57 +0200, fons(a)kokkinizita.net wrote:
On Wed, 2010-07-14 at 19:56 +0200, Arnout Engelen
wrote:
Please make a test without any program using JACK, just connect the
DX7 port to the D4 port with aconnect(gui), and try that.
Regards,
Clemens On Wed, Jul 14, 2010 at 03:23:03PM +0200, Ralf
Mardorf wrote:
I'm connecting MIDI in the Qtractor (quasi QjackCtl) ALSA MIDI tab. Yamaha DX7 --> Alesis D4 results in a 100%
musical groove.
Yamaha DX7 --> PC --> Alesis D4 results in extreme latency
So here you're directly routing the MIDI IN to the MIDI OUT, and experiencing
latency. Are you using JACK here, or directly ALSA? In other words, are you
connecting 'in' to 'out' in the qjackctl 'MIDI' tab or in the
'ALSA' tab? I'm sure they would be sensitive to bad timing.
But that's not
the question. Would they be able to identify the recordings listed
above ? Until you try it you won't know, and your claim that 2 ms
of jitter 'destroys the groove' is pure conjecture.
Who knows? Perhaps 2ms shown by Audacity are 20ms, because Audacity has
a bug? Perhaps 2ms shown by Audacity are 2ms, but when playing JACK, the
sound card or what ever will add additional jitter?
I can't test the list, because on my machine there is something audible.
On Thu, 2010-07-15 at 09:56 +0200, Arnold Krille wrote:
On Thursday 15 July 2010 01:14:45 Ralf Mardorf wrote:
Perhaps it's not that 2ms, but here are audible issues. As I mentioned before.
Audacity shows 2ms, but JACK, the driver the hardware might add jitter.
FWIW blind tests aren't scientific,just double-blind studies are meaningful. And if
you wish to test cables you need to test the quality after one year, after two years etc..
Anyway, a bad cable might cause a bad sound quality, but not bad timing.
Timing is the meat and potatoes to music.
Regarding to my Linux computer such studies aren't needed. A bad timing is a bad
timing.
At least for the USB MIDI that I'm not using anymore, I made tests with a Windows
install (I don't have this install on my machine anymore, so I can't test the PCI
card with Windows).
The USB MIDI was much better on Windows, even better than the PCI cards at the moment are
on Linux. So I guess, yes I don't know, that the hardware is ok.
- Ralf
On Thu, 2010-07-15 at 00:46 +0200,
fons(a)kokkinizita.net wrote:
You really should do that test first before speculating about the outcome and
your audience.
You would expect Audiophiles to spot the "super sounding" denon cables by
listening, right? Yet a blind test showed the opposite. The test was to
identify which audio take was played with denon-cables, el-cheapo cables from
walmart and a bended cloth-hanger. If they where as good as they claimed, the
denon-cable should get hits with probability significantly better then 1/3,
otherwise its just luck.
Guess what the outcome was: There was a significant hit: But they spotted the
cloth-hanger as the denon-cable. Thats what real experts do...
Do the listening test with as many people as possible and then show the
results. And only afterwards start the speculations what the reason and the
effects might be. (Thats called science btw.)
Have fun,
Arnold Apart from that, it remains to be seen if *real*
timing errors of
+/- 2 ms do 'destroy the groove'. To test this, make the same
recording
- without jitter,
- with 1 ms jitter,
- with 2 ms jitter,
- with 3 ms jitter.
and check if listeners are able to identify which is which,
or at least to put them into order.
I know very gifted musicians who do like me
and they always 'preach'
that I should stop using modern computers and I don't know much averaged
people. So the listeners in my flat for sure would be able to hear even
failure that I'm unable to hear.