mx-20 bassline

vanilla bassline seq with new core filter

(104 Votes)
1.0 (Updated 13 years ago)
68.7kB
September 10, 2005
Reaktor 5 or lower
Instrument Sequencer

DESCRIPTION

Nothing special here, but I was fooling with the core and came up with a new filter, loosely modeled after the Korg MS-20. Added the Plasma sequencer borrowed from the prolific Steven V. And a delay. Which you can turn off.
Some of the presets will cause an overload on startup for some reason.

COMMENTS  (13)

Christopher Soulos
11 years ago
Cool As
Lutz Demmler
11 years ago
thanks a lot, really good!!
Robert Gage-Smith
12 years ago
nice and squelchy :-)
Stephan Becker
13 years ago
Cool.
herw
13 years ago
@James ah i understand, thanks; btw it is not "hyperbolic arc tan" but "hyperbolic tan": tanh(x)=(e^(2x)-1)/(e^(2x)+1) see structure of tanh-module.
James Clark
13 years ago
Herwig, a transconductance amp converts a voltage into a current, just like a resistor, but they usually have an adjustment input that can set the scale factor. In Reaktor you can implement them very simply just with a multiplier module. But most real-life transamps are nonlinear in that the effective (the scale factor)is not constant, but decreases as the input voltage gets away from zero.The input-output relationship is very well modeled as a hyperbolic arc tan function.
herw
13 years ago
thanks! yes i see several sites about transconductance amps (google) but how can you translate it into reaktors core cell or dsp. Are there any links?
James Clark
13 years ago
Jeremiah, the mx-20 filter is encapsulated in a core cell which can be found in the ensemble. Of course, part of the sound of the ensemble comes from the parallel ladder filter, so you might want to use that too. Herwig, the mx-20 filter is derived from the analog ms-20 schematics (available in many places). I converted it to a digital filter by replacing the resistor-capacitor combos with simple digital integrators. This does not give an accurate modeling of the ms-20 frequency response (better to use a bilinear transform approach for that), but is good enough for musical purposes. The distortion aspect of the ms-20 is modeled in two places - first the nonlinear characteristics of the resistors (usually implemented as transconductance amps) are modeled with one set of hyperbolic arc tan functions. The second place is the deliberate (in the ms-20) distortion caused by the output amp, which is modeled with another hyp arc tan. Finally resonance is modeled with simple feedback. There is a DC-blocking high pass in the resonance feedback. It adds a little bit to the sound and prevents some problems. The resonant frequency is not a linear function of the freq input. By my calculations, at zero resonance the cutoff freq is f/(1-f)(3-f), where f is the frequency input. Bad things happen when f is more than 1/3.
Jeremiah Savage
13 years ago
I'd like to see the filter by itself.. it's a great sounding filter that i would love to use with other synths.
herw
13 years ago
Hi James, i want to add a comment and a question: I like the warm and smooth sound of your filter. It is a very musician filter. my question: I want to understand how you have build the filter. The structure is very difficult to understand. I see in your main structure three filters (two MS-20 filters in serie and a parallel ladder filter). The inner structure of the ms-20 filter seems to be a second order filter. Can you give more information about constructing? ciao herw
herw
13 years ago
yes - thanks
GG.G SakabeaT
13 years ago
yeh,a delicious filter...thx for sharing this kind of thing!
raphael esterson
13 years ago
As you say, plain vanilla for the instrument concept, but the filter sounds brilliant, and is just waiting to be used elsewhere. James, your work always has bags of character, and doesn't sound like reaktor. Nice one! wuntun
now