Alesis Micron Reference Manual page 67

6
Programs
FM Type
A. Linear FM types
lin 2 > 1
Oscillator 2 is added to the phase of oscillator 1. Linear FM is the
style used by typical FM music synthesizers. Modulating a sine
wave with another, higher-frequency sine wave produces a
fundamental frequency with a variety of overtones, and this can be
used to reproduce the sounds of many physical musical
instruments.
lin 2+3 > 1
Oscillators 2 and 3 are added to the phase of oscillator 1.
lin 3 > 2 > 1
Oscillator 3 is added to the phase of oscillator 2. The resultant
waveform is added to the phase of oscillator 1.
With linear FM, the FM Amount controls the "modulation index",
with a level of 100% providing an index of 32.
B. Exponential FM types
exp 2 > 1
Oscillator 2 modulates the pitch of oscillator 1.
exp 3 > 2 > 1
Oscillator 3 modulates the pitch of oscillator 2. The resultant
waveform modulates the pitch of oscillator 1.
With exponential FM, the FM Amount controls the range of pitch
modulation, with a level of 100% driving the pitch up and down a
full six octaves.
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