Need help removing "crackles" from patch (fm module) *solved*

[elxsound]

I pretty much have this patch sounding the way I like, except for some unwanted crackles which I've narrowed down to the FM module or detune of the Osc.

I was hoping someone could take a look in case there is a solution or a workaround, or even help correct user error.

I was thinking introducing a filter somewhere might solve this, but so far when I've added it, the sound is altered too much. I still consider myself new to this, so I appreciate any suggestions.

The patch is called District 9 because I was aiming for it to sound like it did in the movie when the ship was moving (press F2 or F2 + C3).

The patch can be downloaded here (old version w/crackles):

http://www.box.net/shared/tj843b2dib


And in case you want to hear the sound, you can see the trailer here:

Just keep in mind, that in the trailer, at least once they layer the sound with what sounds like a large steam whistle (not sure what you'd call that).

Edit:

Patch fixed... new version here: http://www.box.net/shared/11tauhgmhs

[polyfonken]

a 6db filter inserted after the xfm seems to soften the frequency modulation "ripples", sounding pleasant at least to my ears.

[Urs]

Cool! I recognized the sound immediately

I think the problem with thr FM is that you're sending a detuned oscillator into it - this produces occasional peaks which I think create the crackles. If you set the oscillator to "dual" and width to 100%, the crackles are nearly gone. I would do that and then rebuild the OSC-FMO structure on Grid lane 2 (with different detune values of course) and mix that together using a mixer into the VCF-XMF combo:

Code: Select all

osc1 osc2
  |   |
fmo1 fmo2
  | /
mix1
  |
vcf1
  |
xmf1

[elxsound]

Nice!

Thanks polyfonken and Urs. I'll try both now.

[elxsound]

Alright, I think this is much closer. I went with Urs' way and it sounds much more thick.

It lost some brightness, but turning up normalize on each oscillator brought the brightness back (please let me know if I should have done something else).

Also, by turning up the cutoff on the xmf greatly improved things.

Here is the revised patch now: http://www.box.net/shared/11tauhgmhs