## 6d highpass for modular wanted! (4 a serous project!)

Device/Module Wishlist

Original topic on PlanetZ: https://forums.scopeusers.com/viewtopic.php?t=9949

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Posted: Thu Jul 31, 2003 4:09 pm
by bosone
is there the possibility to convert the "mutlimode filter A" (this would be the best i think, but any of the resonant filters would be ok...) of modular 2 in a 6db higpass /lowpass?
i'm trying to build an emulation of korg ms20 (with ms-20's sampled waveforms), but i found that the highpass filter is a 6db, instead of a 12db.... i cannot use the "simple" 6db, because it lacks modulation inputs...
anyone can help?
thanks!
_________________
Listen to my music at
http://www.alchemystudio.it

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Posted: Sat Aug 02, 2003 12:51 pm
by darkrezin
FleXor will have what you need.
http://www.adern.com/products/flexor/fl ... s/hp-1.htm
peace

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Posted: Sun Aug 03, 2003 10:16 am
by bosone
damn... it doesnt have the resonance control!
but apart this i foudn that the reproduction of klorg ms-20 is VERY complicated!!!

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Posted: Mon Aug 04, 2003 11:43 pm
by petal
Why don't you write and ask Red_Muze about your needs - Perhaps it isn't so complicated to make a Hi-Pass filter with resonans - I mean, he has the filter allready, and resonans is included in most of the other filters, so he knows how to do it, and he has proclaimed that new modules would be added - Why shouldn't your needs be one of them?
Just a thought
Thomas

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Posted: Mon Aug 04, 2003 11:59 pm
by at0m
Why don't you make your own resonance?
Resonance is just a feedback loop: invert the filter's output and mix it with dry signal to the filter's input.

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Posted: Tue Aug 05, 2003 1:49 am
by bosone

> On 2003-08-05 00:59, at0mic wrote:
> Why don't you make your own resonance?

because i don't know how to do it!

> Resonance is just a feedback loop: invert the filter's output and mix it with dry signal to the filter's input.

yeah! now i know!
i'll try it soon!!
thanks

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Posted: Wed Aug 06, 2003 1:38 am
by bosone
i tried to mix the out of the filter with the in... but it seems not possible, because i get an error message referring to a "loop"...

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Posted: Wed Aug 06, 2003 2:22 am
by at0m
insert a "Xmod&Feedback Connector" in the loop...

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Posted: Thu Aug 14, 2003 4:47 am
by visilia
Technically, a 6dB (1 pole filter) HiPass filter with resonance is impossible to make. A filter with resonance control must be at least 12dB (2 pole filter). Manually using a feedback control with a 6dB filter will result in a filter with a steeper slope than 6dB. Unfortunately I can't tell you exactly why, because the mathematics for this are too complicated for me
However, I just wrote this to clear things a little bit up (I hope). This feedback trick might give you exactly the results you want.
Cheers,
Vincent