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Subject: Re: [yamahacs80] Unique keyboard features

From: David Rogoff <david@...>
Date: 2011-02-07

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>
>
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> I just put in a couple of comments there, including about the (as far
> as I know) unique Sustain I/II modes. Does anyone know of any other
> keyboards, besides the CS50/60/80 that have this ability to have a
> long release time but have new notes cut off old ones? I think it's an
> amazing feature of the CS80 and have never seen it anywhere else.
>
I realized a little bit ago that I didn't know how the CS80 did the
Sustain I/II trick. So, I've been looking through the schematics - and
I'm still confused! I only see the Sus I/II switch going to the SH
board. This explains the Sus I/II behavior of glide continuing after
letting go of keys in Sus I but freezing pitch in the middle of a glide
in Sus II (or is it the other way around??). However, it doesn't
explain how notes get cut off. I thought I was onto something, but it
was just the mixing of the Sustain slider on the left-hand panel (PN3)
with the programed VCA and VCF release voltage going to the M cards.
This circuit is on the Sub board. Where did I get lost (which is easy
to do on the giant schematic)? I don't see the Sus I/II switch
connecting anywhere else.

By the way, I wish the CS80 didn't freeze the glide in Sus II mode. I
think I might temporarily disconnect that wire to hear how it sounds
with glides finishing in that mode.

David


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