In article , Nudge wrote:

About the mic sound:
It was the first time I tried the miking method as described on the
shure website: dead center, 4" away from the grill. That should give
an "well-balanced, natural" tone. Indeed, it's rather bright.
http://www.shurenotes.com/issue6/article.asp?flash=true

No, that gives a very bright tone. Turn the amp down and put your head
in front of it. Stick a finger in one ear while somebody plays with the
other, and listen to how the amp sounds as you move around it. It sounds
different in the center than it does on the edge, and it sounds even more
different in back.

About the noise:
I took another track with the mic more on the edge: it's more obvious.
But the real problem is:
That problem occurs only in the digital domain.
I tried the analog output and there, the crispy noise doesn't
exist. Even with a somewhat hotter signal.
That's why I thought it was jitter. It isn't, as I learned.

How do you know?

I have some options left:
- dropouts caused by a bad RCA cable
- dropouts caused by bad latency settings/buffer sizes
- bad syncing mode (Sonar set to "Full Midi Chase")

Bad synching mode would sound reasonable. First of all, try recording a
voice or something that is easy enough to tell if it is distorting, rather
than a guitar amp.

Secondly, try recording from the S-PDIF output on a CD player. If you can
do that properly, you should be okay to record from your A/D box. If you
cannot, the problem is in your soundcard setup or software configuration.

I have prepared yet another mp3 using a clean guitar,
played by someone else. It's about 300KB and lasts only 7 seconds.
I don't want to waste your time and I appreciate your help very much.
Believe me, in this sample, it's absolutely obvious.
http://www.lieber-media.de/mathias/s...386_noise2.mp3

I'm on a shell service. I can't listen to mp3s or look at graphics.
But I'd bet that fiddling with your clock configuration will help a lot.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."