PlanetZ forums - scopeusers.com

I'm too lazy to read through all topics to find something about my problem. I could need some quick help here.
I never noticed them before, suddenly my faders on mixers 1632 & co. & everything that's changing volume crackles - some high-pitch-jittering or however to call this. Es knistert und bruzzelt irgendwie digital. I have no idea why. No, it's no dust in the mixer ... It should have nothing to do with interpolation, cause I think I used some interpolated faders.
Oh, it's the same on my other systems... hm... Only really audible when bass-sounds change volume.

HELP!

Martin

It's refreshing to see that even the Gods require help from mortals from time to time.

That was my first thought - to clean the faders from dust and mud.
Seriously: Does it crackle when you move the fader with the mouse or even when the fader moves automatically via MIDI? Seems to be a problem with the graphic card ... Try to fiddle with the graphic acceleration or /and with the priority settings from Scope and the sequencer.
Good luck, Thomas

It happens on totally different machines & has nothing to do with mouse vs. midi movement. I allready tried with graphic-accelleration etc. It's really inside the cards... I will try on a third system soon, but I think I just didn't get it before last week because it's only audible on bass sounds, when you have a loud sound with not too much highs ( so you can hear high digital noises).
It dissappears with my selfmade faders, so it seems to be a fader problem, not a card or computer problem. At least I guess having it on TWO systems here there should be others who can reprroduce it!

thanks anyway

Martin

MCCY wrote:... because it's only audible on bass sounds, when you have a loud sound with not too much highs ( so you can hear high digital noises)...

wrong guess, Martin - it's only noticable on (more or less pure) sine sounds, at any frequency and in no way restricted to SFP

cheers, Tom

O.K., I stand corrected.
It seems to have something to do with the resolution that a contol-input can handle combined with interpolation of the faders - maybe some async/sync stuff alos influences this. Otherwise it would have not been possible to build a workaround with my "passive" faders I think which are of course more active than passive b.t.w.

What's the math behind this sinus-can't-be-volume-faded-correctly-without-noise-thing? But no, I don't want to know it I won't understand anyway.

Martin

neither do I...
my solution would be to mute, set, unmute audio - is that how your faders work ?

actually I don't think it's related to math, but the artifact is masked by natural overtones or noise - a (truely) pure sine does not have any overtones at all afaik

cheers, Tom

No, they work in realtime, but with pure sync signal & without amplification. You can just reduce loudness. Therefor I called them "passive". Set max volume needed in the mixer or instrument then cut volume with those faders if necessary in realtime. I could make them even react faster, it anybody is interested in it, or variable reacting is possible also.

Martin

a fast movement of a fader makes in worst case a sin to a sawlike wave which adds overtones to the fundamentalfrequency
its all about math . .
simpley dont move so fast, relax

_waiting for relaxed faders;

good vibes from vienna

tgstgs wrote:...its all about math . .
simpley dont move so fast, relax ...

yes, in the end it all breaks down to math
but it really doesn't need a fast movement to clearly hear the zipping - in fact you can hardly move a fader without noticing it (on sines), but then... who's listening to test tones all day long ?

cheers, Tom

If any low level sync modules aren't providing accurate timing that could cause all sorts of issues. I'm not saying that's the case, but if it was, then...

Does it happen if you minimize scope ?!

i had the same problem, just use the bigger mixers.. 2496 ( or whwatver they are called. the stock creamware ones.) I dont think they have the same jitter problem..

Async signal / gfx priorities?