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Figure 8-5 shows the results of looping envlopes. If the loop is o, then the
envelope remains at point 3 with level 3 for as long as the key is held. But by
using envelope looping, LFO, restrike, and echo eects can be created. In
(a) the loop is between points 2 and 3, in forward/backward mode, with two
repeats. This produces a short tremolo (if applied to the amplier). In (b) the
1-2-3 segment is repeated a few times, which in eect creates an interesting
waveform out of the envelope. In (c), the oscillation eect is more obvious.
For an exponential attack, you have to approximate the shape using linear
segments. In other words, segment 0-1 would have a slight slope: segment
1-2 a medium or higher slope: and if desired, segment 2-3 a steep slope.
Figure 8-5
ENVELOPE LOOP EXAMPLES
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