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 Forum index » Clavia Nord Modular » G2 Patches - Experimental
Low Level DSP: Moog Ladder Filter
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ik



Joined: Jan 30, 2005
Posts: 50
Location: North Carolina
G2 patch files: 25

PostPosted: Sun Mar 13, 2005 10:36 am    Post subject: Low Level DSP: Moog Ladder Filter Reply with quote  Mark this post and the followings unread

Rolling Eyes
An excercise to go after the infamous 'Moog ladder filter'.
A cascade of four 1 pole filters coupled, then after clipping (x^3) the signal feedbacked to pole 1. Based on (but modified) the info published at musicdsp as well as in SynC Modular ...
Cutoff, Resonance, In, Out marked with '(deep)purple color'
(Cutoff: 0-1(64); Resonance: if >=2 starts to self oscillate ...)
ik.


Moog Ladder.pch2
 Description:
Moog Ladder Filter excercise :-))

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 Filename:  Moog Ladder.pch2
 Filesize:  1.79 KB
 Downloaded:  1246 Time(s)

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ik



Joined: Jan 30, 2005
Posts: 50
Location: North Carolina
G2 patch files: 25

PostPosted: Sun Mar 13, 2005 11:59 am    Post subject: Reply with quote  Mark this post and the followings unread

... and the same from Clavia 1 poles ...
ik.


Moog Ladder 2.pch2
 Description:
Moog Ladder from Clavia 1 pole cascade.

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 Filename:  Moog Ladder 2.pch2
 Filesize:  1.39 KB
 Downloaded:  1138 Time(s)

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ian-s



Joined: Apr 01, 2004
Posts: 2669
Location: Auckland, New Zealand
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PostPosted: Sun Mar 13, 2005 11:26 pm    Post subject: Reply with quote  Mark this post and the followings unread

More great work thanks.
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cebec



Joined: Apr 19, 2004
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PostPosted: Mon Mar 14, 2005 7:54 am    Post subject: Reply with quote  Mark this post and the followings unread

i like the way this filter sounds
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ik



Joined: Jan 30, 2005
Posts: 50
Location: North Carolina
G2 patch files: 25

PostPosted: Mon Mar 14, 2005 2:49 pm    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
...i like the way this filter sounds...

Thanks!
I wonder, how close it is to a REAL (hardware) Moog filter ...
Question Question
ik.
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mosc
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Joined: Jan 31, 2003
Posts: 18177
Location: Durham, NC
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PostPosted: Mon Mar 14, 2005 3:43 pm    Post subject: Reply with quote  Mark this post and the followings unread

Assuming we had someone, (who could that be?) that actually has a Moog Modular what kind of test could we use to compare the two?

I've tried tests like this before and there are lots of complications. What do you use for inputs. The Moog oscillators are not exactly like those on the G2. They are inacurate by comparison - some say this is charming. The noise generators sound different. How do you set a Moog filter to the same cut off as G2? Is and mp3 good enough to play back the results? etc. etc. etc.

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cebec



Joined: Apr 19, 2004
Posts: 1097
Location: Virginia
Audio files: 3
G2 patch files: 31

PostPosted: Tue Mar 15, 2005 12:02 pm    Post subject: Reply with quote  Mark this post and the followings unread

Possibly it could be done with the VCO, VCF, VCA going directly to the recording device at an arbitrary level, say -5 dB on the devices input meters and rendered at a 44.1 kHz .wav.
The G2 would be recorded the same way...
Some sweeps up and down at various resonances might be a start...
I know, not a lot of fun... but if anyone with a Moog and some spare time might be willing to try it, it could be interesting.
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seraph
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Joined: Jun 21, 2003
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PostPosted: Tue Mar 15, 2005 2:29 pm    Post subject: Reply with quote  Mark this post and the followings unread

cebec wrote:
if anyone with a Moog and some spare time might be willing to try it, it could be interesting.

Posted Image, might have been reduced in size. Click Image to view fullscreen.
guess whose studio is this one Very Happy

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The Why Project



Joined: Dec 05, 2004
Posts: 118
Location: Ireland
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PostPosted: Tue Mar 15, 2005 2:58 pm    Post subject: Reply with quote  Mark this post and the followings unread

seraph wrote:
guess whose studio is this one Very Happy


The studio of somebody who lives in it Laughing

Greetz,

The Why Project
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ik



Joined: Jan 30, 2005
Posts: 50
Location: North Carolina
G2 patch files: 25

PostPosted: Wed Mar 16, 2005 5:44 am    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
...Possibly it could be done with the VCO, VCF, VCA going directly to the recording device...

Well, I don't have any hardware Moog, but downloaded Arturia's Minimoog V demo.
On oscilloscope, the output the two filters have VERY similar characteristics regarding cutoff and/or resonance change (I can post pictures if one interested, it will take some bandwidth...I dont know if it's a problem ....)

So this file is based on Arturia's MiniMoog V, anyone wish to check out
or if one (Question) could compare to a hardware Embarassed ...
ik.


mimiMoogy.pch2
 Description:
MoogFilter testdrive.

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 Filename:  mimiMoogy.pch2
 Filesize:  2.41 KB
 Downloaded:  1161 Time(s)

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mosc
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Joined: Jan 31, 2003
Posts: 18177
Location: Durham, NC
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G2 patch files: 60

PostPosted: Wed Mar 16, 2005 6:27 am    Post subject: Reply with quote  Mark this post and the followings unread

I did a test once, perhaps a pretty sloppy one envolving an early version of the Arturia, the NM1 and the Moog.

http://electro-music.com/forum/topic-70.html

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