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Chapter 4: Programming Basics
45
PROGRAMMING BASICS
Another control on the filter is called Q or resonance. On a lowpass or
highpass filter, turning up the Q of the filter emphasizes the frequen-
cies around the cutoff frequency. The chart below shows how different
amounts of Q affect the lowpass filter response. In terms of sound,
frequencies around the cutoff will tend to “ring” with high Q settings.
If the filter is swept back and forth slowly with a high Q, various
overtones will be “picked out” of the sound and amplified as the
resonant peak sweeps over them. Bells and gongs are real world ex-
amples of sounds which have a high Q.
Turning up the “Q” will emphasize the frequencies around the cutoff point.
Another important feature of a filter is the number of poles it con-
tains. The lowpass filters on Planet Phatt can be either 2-pole, 4-pole
or 6-pole filters. The highpass and bandpass filters can be either 2nd or
4th order filters another way to describe the number of filter sections
they contain. The number of poles in a filter describes the steepness of
its slope and the more poles the steeper the slope, which in turn
affects the sound. In general, the 2-pole filter will have a buzzier
sound and the 4-pole filter has the classic low pass resonant filter
sound. Planet Phatt's 6-pole low pass filters create a tight, modern
sound.
Frequency
Amplitude
Low Q
Med Q
High Q
Frequency
2-pole
6-pole
Amplitude
4-pole
Summary of Contents for Planet Phatt
Page 1: ...OPERATION MANUAL E mu Systems Inc Fhlanett Phatt ...
Page 9: ...1 Chapter 1 Basic Setup INTRODUCTION BASIC SETUP ...
Page 10: ...Planet Phatt Operation Manual 2 ...
Page 17: ...Chapter 2 Basic Operation 9 BASIC OPERATION ...
Page 18: ...Planet Phatt Operation Manual 10 BASIC OPERATION ...
Page 27: ...Chapter 3 Master Menu 19 MASTER MENU ...
Page 28: ...Planet Phatt Operation Manual 20 MASTER MENU ...
Page 43: ...Chapter 4 Programming Basics 35 PROGRAMMING BASICS ...
Page 44: ...Planet Phatt Operation Manual 36 PROGRAMMING BASICS ...
Page 63: ...Chapter 5 Edit Menu 55 EDIT MENU ...
Page 64: ...Planet Phatt Operation Manual 56 EDIT MENU ...
Page 88: ...Planet Phatt Operation Manual 80 EDIT MENU ...
Page 89: ...Chapter 6 Step By Step 81 STEP BY STEP ...
Page 90: ...Planet Phatt Operation Manual 82 STEP BY STEP ...
Page 103: ...Chapter 7 Reference Section 95 REFERENCE SECTION ...