20_20_5
additional parameters: imax1, ifq2, imax2


This is a very sophisticated FM instrument imitating a trumpet
tone. There is a vibrato generator consisting of random amplitude
deviation, a slow amplitude vibrato and a portamento pitch
deviation. All these units combine to give an oscillating value
in the proximity of 1.

The general design is a double carrier FM instrument, using a
single envelope function for amplitude and modulation index.
Implemented by LINSEG, the rise and decay portions keep their
absolute values for different durations. As in 20_20_4, the index
and the amplitude envelopes of the second carrier are scaled
before being applied to their targets. (Morrill 1977)

(flowchart)
(.orc and .sco files)
