Casio CZ/ VZ/ FZ - Pro Series

>I haven't figured out what you are saying (because of my English...)
>But issue of decay sound led me to think that 4-bit DCO may not control
>volumes well.

What I mean is that you should look at the waveform as it decays to see if 
it actually changes.  I doubt the volume control part plays into the 4-bit 
waveforms, there would be a lot of quantization noise and there would be 
audible stepping in the volume envelope.  I would imagine that the amplitude 
control comes after the waveform generation part.

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