01_01_2B
additional parameters: idec


Envelope generator ENVLPX and a 10 harmonics wave synthesize
plucked notes. The exponential f51 merely provides the rise
shape. The time of this rise is kept short (10 msec), while the
decay time is the sole free variable. Setting iatss=1 keeps the
amplitude stable during the steady state period of the envelope,
and iatdec controls the attenuation rate during decay time. For
iatdec, the value of 0.01 is ideal. An excessively small value
(say 0.0001) is likely to produce an audible cutoff.

As a matter of fact, the envelopes in this example do not have a
steady state period, because the variable idec is set to values
that exceed the duration of the notes. In this case the decay
period starts directly after the end of the rise period.

A comparison of this instrument with the previous one shows that
the plucked sound quality solely stems from the characteristic
pluck envelope: a short exponential rise and a long exponential
decay. (Risset 1969: #250)

(flowchart)
(.orc and .sco files)

