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Need some help.

PostPosted: Sun May 19, 2019 6:56 am
by Halon
Good morning.

Im having trouble with the filter in my current synth project.

When modulating the filter cutoff with either the envelope, lfo or the modwheel there is a 'pop' sound and then the sound gets muted. Ive no idea what causes that so im hoping some of you could have a look at the schematic ?

Cheers.

EDIT:

Removed the schematic since Martin helped me.

Re: Need some help.

PostPosted: Sun May 19, 2019 7:40 am
by martinvicanek
One of the Moog filters has no Cutoff Range Check. Copy it from the other Moog filter and you'll be fine. ;)

Re: Need some help.

PostPosted: Sun May 19, 2019 9:27 am
by Halon
Aha. Thanks Martin!

Re: Need some help.

PostPosted: Tue Dec 24, 2019 4:49 am
by gvalletto
martinvicanek wrote:One of the Moog filters has no Cutoff Range Check. Copy it from the other Moog filter and you'll be fine. ;)


I have just one Moog filter. Where is the another one?

Re: Need some help.

PostPosted: Thu Dec 26, 2019 2:12 am
by gvalletto
... and the only filter that I have in the toolbox has already the Cutoff Range Check but the pops stay there...

Those pops occur when the cutoff goes down quickly, for example, when using an ascending ramp to modulate the cutoff. On the contrary, when the cutoff goes up quickly, no pops. For example, when modulating with a saw (that is, a descending ramp), all sound ok.
any idea to solve it?

MV's Moog Filter

PostPosted: Tue Dec 31, 2019 11:18 am
by martinvicanek
I took the opportunity to implement a ZDF Moog filter. Should be OK for fast modulation. You may use it without limitation.

Cheers!

Re: Need some help.

PostPosted: Wed Jan 01, 2020 1:51 am
by k brown
Wow - the level of this drops like crazy as soon as any Res is applied - did the hardware Moogs really behave that way; I know they did drop, but this much?

Need some help

PostPosted: Wed Jan 01, 2020 2:12 pm
by mrRandallVen
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Re: Need some help.

PostPosted: Wed Jan 01, 2020 6:50 pm
by Halon
k brown wrote:Wow - the level of this drops like crazy as soon as any Res is applied - did the hardware Moogs really behave that way; I know they did drop, but this much?


Ive no experience with moog synths but i would say no. Maybe some of the earlier revs did? Ive no idea

Re: Need some help.

PostPosted: Wed Jan 01, 2020 8:16 pm
by martinvicanek
It is a property of the particular circuit topology. However,if it bothers you it can be easily compensated, refer to updated post above.