one thing that still baffles me to this day about the cut filter is the way it really works. many people just say "you can hear what its doing"... but do they really know?

now a "Fast LP/CUT" pretty much just muffles the sound but a cut filter on a 404 or a synth is different.



behind the scenes, what is it really morphing as you tweak the filter knob?

I'm just curious thats all

Im not sure... But if i was to guess id say it raises something related to the high-end of the sound frequency.

A lowpass filter is like an equalizer that cuts out all the high frequency sounds, with the point where the sound is cut off varying with the cutoff knob. Resonance is how high the spike is in the part where the filter cutoff is applied. Usually the amount filters removed in the cut frequencies are -12 to -24 DB.

Lowpass filter
low frequencies allowed --------^\_______ high frequencies cut

highpass filter
low frequencies cut ________/^------- high frequencies allowed

bandpass filter
low frequencies cut ________/^\________ high frequencies cut
(only the frequencies at the cutoff are allowed)

The resonance effects how loud that little '^' spike is.

A cut on a 303 or whatever may sound a lot different because distortion is added after the filter is applied.

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quote:

Originally posted by Masonious you win again dude - and nice move shoving the whole i figured out how to order pizza thing in my face. i tried that 4 and a half months ago and woke up with a Taiwanese transvestite but to Ygrene it's just, "anoother day in the life, noooo biggieee".

Last edited by Fast Turtle on Oct-29-2004 at 04:49

quote:

Originally posted by Lephaid A lowpass filter is like an equalizer that cuts out all the high frequency sounds, with the point where the sound is cut off varying with the cutoff knob. Resonance is how high the spike is in the part where the filter cutoff is applied. Usually filters are -12 to -24 DB. Lowpass filter low frequencies allowed --------^\_______ high frequencies cut highpass filter low frequencies cut ________/^------- high frequencies allowed bandpass filter low frequencies cut ________/^\________ high frequencies cut (only the frequencies at the cutoff are allowed) The resonance effects how loud that little '^' spike is.

i like your diagram =)

quote:

Originally posted by hadi ****** i like your diagram =)

thank you

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quote:

Originally posted by Masonious you win again dude - and nice move shoving the whole i figured out how to order pizza thing in my face. i tried that 4 and a half months ago and woke up with a Taiwanese transvestite but to Ygrene it's just, "anoother day in the life, noooo biggieee".

also there are envelope parameters to think about, where you control attack, sustain, decay and release of the filter, usually coupled with an 'env amount' knob. this can alter the way one LP filter sounds compared to another LP flter.

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no no no, im talking about the types of cuts that you find on synth lets say for example a 3xOsc... that cut seems way different

fast LP is a quickly and badly rendered low pass (12db)
lp is lowpass (12db)
lpx2 is lowpass(24db)
svf is a state variable lowpass filter (12db)
svfx2 is a state variable lowpass filter (24db)
bp is bandpass (12db)
hp is highpass (12db)

cut is the same thing on all of them...

quote:

Originally posted by meneedit no no no, im talking about the types of cuts that you find on synth lets say for example a 3xOsc... that cut seems way different

I *think* it sounds different because it's applied before the sound is generated/processed, as opposed to afterwards (like it would if you used a 3rd party filter), which makes it sound better. Don't quote me on that though... have no proof to back it up.

quote:

Originally posted by isoterra I *think* it sounds different because it's applied before the sound is generated/processed, as opposed to afterwards (like it would if you used a 3rd party filter), which makes it sound better. Don't quote me on that though... have no proof to back it up.

No, they all work the same way pretty much.

quote:

Originally posted by Lephaid No, they all work the same way pretty much.

i agree

quote:

Originally posted by Lephaid No, they all work the same way pretty much.

Well they certainly sound very different. A quick demo:

http://terrafusion.artists.mpfspromotions.com/cut1.mp3 - automated the cutoff filter on the 3xOSC synth itself

http://terrafusion.artists.mpfspromotions.com/cut2.mp3 - automated the cutoff using a 3rd party filter plugin

Both LP.