Need some help.

by **Halon** » Sun May 19, 2019 6:56 am

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.

by **martinvicanek** » Sun May 19, 2019 7:40 am

One of the Moog filters has no Cutoff Range Check. Copy it from the other Moog filter and you'll be fine.

by **Halon** » Sun May 19, 2019 9:27 am

Aha. Thanks Martin!

by **gvalletto** » Tue Dec 24, 2019 4:49 am

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?

by **gvalletto** » Thu Dec 26, 2019 2:12 am

... 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?

by **martinvicanek** » Tue Dec 31, 2019 11:18 am

I took the opportunity to implement a ZDF Moog filter. Should be OK for fast modulation. You may use it without limitation.

Cheers!

by **k brown** » Wed Jan 01, 2020 1:51 am

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?

by **mrRandallVen** » Wed Jan 01, 2020 2:12 pm

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by **Halon** » Wed Jan 01, 2020 6:50 pm

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

by **martinvicanek** » Wed Jan 01, 2020 8:16 pm

It is a property of the particular circuit topology. However,if it bothers you it can be easily compensated, refer to updated post above.

Need some help.

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