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Chapter 4: Programming Basics 43

PROGRAMMING BASICS

FILTER MODULATION

Planet Phatt contains a Z-plane filter for each of its 32 channels. The

block diagram of a single channel is shown below.

The Tone filter is a simple tone control and can be used to brighten

or darken the tone of an instrument. Each of the 17 Z-plane filters is a

powerful synthesizer filter which can dramatically alter the sound of

an instrument.

WHAT IS A FILTER?

To understand how a filter works we need to understand what makes

up a sound wave. A sine wave is the simplest form of sound wave. Any

waveform except a sine wave can be analyzed as a mix of sine waves at

specific frequencies and amplitudes.

One way to represent complex waveforms is to use a chart with fre-

quency on one axis and amplitude on the other. Each vertical line of

the chart represents one sine wave at a specific amplitude.

Volume

Pan

Volume

AHDSR

Instrument

Pitch

Sample

Start

Tone

Z-Plane

Filter

DCA

Aux.

DAHDSR

Velocity

Morph Q

40 80 160 360 720 1440 2880

Frequency

Amplitude

1 2 ... 46 47 48 49 50 51 52 53 54 55 56 ... 139 140

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E-Mu Morpheus Instrucciones de operaciones Pagina 51