Fader crackling

[MCCY]

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

[dawman]

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

[Herr Voigt]

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

[MCCY]

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

[astroman]

... 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

[MCCY]

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

[astroman]

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

[MCCY]

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

[tgstgs]

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

[astroman]

...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

[Shroomz~>]

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...

[FrancisHarmany]

Does it happen if you minimize scope ?!

[the19thbear]

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..

[Shroomz~>]

Async signal / gfx priorities?