@database SFX

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

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

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

@node main "Operators : Amplify"

Amplify
-------

Function  :	Volume change of sample
Parameters:	Amplifyfactor	Volume in %
		MaxVol		Will calculate the maximum "Amplify" without
				exceeding the maximum Amplitude. Results are
				put into Par0 and Par1.
		Wrap		Lets you pick the way "overdrive" (exceeding
				max Amplitude levels) is handled if it occurs.
				There are three ways :
				Normal: the overdriven data is set to
					max amplitude or minumum.
				Wrap1 :	the overdriven part is put into the
					surrounding sides of where the Over-
					drive happened until it is completely
					in the normal area.
				Wrap2 : the overdriven part is overturned
					until it is completely in the
					normal area.
				Go ahead and try these modes. Get a long sine
				wave and slowly overdrive it (peaks hit the
				ceiling:). Sound will become sharper.
ARexx     :	RampS/E	<Amplification> 0..1000 %
		P1ModBuf,P1ModShape,P1ModMode
		Wrap	<WrapMode> 0->Normal/1->Wrap1/2->Wrap2
Notes     :	Percussions (bassdrums,snare,drums,...) can be lifted a bit
		(ca. 120 %). This'll produce the typical overdrive effect,
		by clipping sample data (vertically).
		Amplification without hitting the ceiling hard, can be estimated
		taking a look at the min-and maxlines in the @{" Samplewindow " link Charpter1.2 }
		This operator can also be used for Amplitudemodulation, cre-
		ating possiblities for Soundsynthesis.
		For example, make one sine wave with normal period and another
		with double. Let the normal period sine be the source and
		the double period sine be the modulation waveform with User0
		set. Set Par0 to 0 and Par1 to 100. Generate this and take a
		close look (with zoom maybe?:) at the result.
@endnode