02_13_1
additional parameters: irise, idec


This run, again translated from the original Music 5 instrument
of Risset, presents an economical way to synthesize brass tones,
or in more general terms, sounds whose spectra depend upon the
amplitude of one component (Mathews and Risset: 1969). 

The design is as follows: LINSEG produces one amplitude envelope
(0 < iamp < 120) which leads straight to the first sinus
oscillator and serves to calculate relative amplitude values for
the harmonics (in this particular case). The modification imposed
by iratio and iconst will lead to an increase of the higher
harmonics, as a function of amplitude. 

For example, for iamp = 100, the seventh harmonic is seven times
as strong as at iamp = 60. During the rise time of the tone, the
higher harmonics will increase more rapidly.

On the other hand they will die away sooner during the decay
period.

The linear scheme that governs this behaviour is laid out in the
figure on page 46. (Risset 1969: #210) 

(flowchart)
(.orc and .sco files)

