@database SFX

(C) Copyright 1993-1996 Stefan Kost
All Rights Reserved

@Remark $VER: Filter-Matrix.guide (26.11.95)
@Remark AmigaGuide-OnLine-Help for SoundFX

@master /guides/sfx.guide
@index /guides/sfx-index.guide/index

@node main "Operators : Filter-Matrix"

Filter-Matrix
-------------

Function  :	Dampens the signal via a Convultionmatrix
Parameters:	Effect		How much the operator effects the outcome
		Cut-Off		Par : Area for Middling-calculations
				Frq : Frequency above which is to be cut
				(you've got to look at this relatively,as the
				Matrix permits many different characteristics
				to be set)
		Resonance	Strength of resonance(also Peak or Q-Factor).
				As a strong resonance thins out the signal,
				an Amplifyparameter(which is modulated) can
				be added that runs parallel with the
				resonance. A resonance of 0 should have an
				amplify of 100%. Higher resonancees should get
				higher amplify values. You'll have to experi-
				ment to find the perfect values.
				(try resonance+100)
		Matrix		List of factors for use with the multiplica-
				tions in the cross section
				Values shold not exceed 15.0.
ARexx     :	EffS/E	<Effectproportion> 0..100 %
		EModBuf,EModShape,EModMode
		RngS/E	<Range> 1..50
		P1ModBuf,P1ModShape,P1ModMode
		FbS/E	<Feedback-Resonancy> 0..1000 %
		AmpfS/E	<Amplification> 0..1000 %
		P2ModBuf,P2ModShape,P2ModMode
		Matrix	<Number> 0..20 <Value> -15.0..15.0
Notes	  :	A Matrix filter, such as this, within the cross section window
		combines the sample data with a matrix that approximates
		the sample value to the mid-value.
		Cut-Off frequencies that are too high might eradicate the
		sample totally.
		The resonancy is based on Feedbackprocess. This produces a
		small peak of the cutoff frequency. The resonancy parameter de-
		termines the size of the peak. Choosing a too high value for
		the parameter could lead to selfoscillation of the filter, as
		it begins to produce sinus sound of the cutoff frequency that
		begins to dominate the signal (->your sample loses out).
		With the matrix you can simulate various Filtercharacteristica.

		!!! NEW !!!
		Negative effectvalues producing the opposite effect - they
		boost frequencys.
@endnode