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portamento
All the du-sounds are polyphonic, i.e.: you can play several notes at the same
time. Yet it is possible to set them as monophonic and then add a glide effect
(portamento) between one note and another, if you don't release the rst
one while playing the second.
Nil value corresponds to polyphonic mode.
adsr: ADSR presets
Besides effects, on the du-touch it is possible to modify the very nature of
the sound. For this, you need to understand how a virtual sound works. Here
is a diagram that shows how sound evolves over time in 4 stages:
When you select the ADSR key, you can access several presets by stroking
the touch strip:
off: no modication
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