The Keyboard & Polyphony - Yamaha Clavinova CVP-83S Owner's Manual

The Keyboard & Polyphony
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The number of available notes is further reduced if the performance memory or
a Disk Orchestra Collection disk is being played at the same time. Further varia-
tion occurs in the CVP-85A and CVP-83S with "1-layer" and "2-layer" voices:
the polyphony is halved with 2-layer voices. The CVP-87A additionally features
stereo voices. The following chart shows all stereo, 2-layer, and 1-layer voices
in the CVP-87A, CVP-85A, and CVP-83S.
The Clavinova also offers keyboard touch response, so the volume and timbre
of notes played can be controlled according to how "hard" you play the keys.
The amount of variation available depends on the selected voice.