Archive of the former Yahoo!Groups mailing list: Yamaha CS80

Hi guys
Just to share with you this fantastic discovery: I had a new look among the patents related to the GX1 and CS synthesizers and found u.s.pn 3636232 and u.s.pn 3784718 relating to the touch response cv circuit : the circuit acts as a double signal which encodes two types of signals going into the same output:

1. a so-called "touch responsive" signal which provides a cv on a level which could be both on amplitude and cutoff: the level isn't just flat but has a decay of 1.5 seconds and a peak slightly higher than the actual sustain level which becomes hearable when the level of the touch responsive signal surpasses the sustain-cutoff level.

2. a so-called "touch irresponsive" signal which provides a sharp AR envelope waveform which has a peak which is independent from the velocity and relates to the first , attack transient, providing a sharp , punchy amplitude cv to the controlled signal. Even though this AR envelope is able o raise its amplitude peak along with velocity

The combination of the two produces a combined cv that acts to give the long sought after "natural" touch response: the AR of the t.i. signal stays quiet under the touch responsive signal under acertain velocity value, then , with high velocities it can raise up to a level higher than the touch responsive signal then decaying down to the touch responsive signal ( for itself the t.i. signal decays to 0 but the combination of the two allows a kind of ADS(R) as the velocity's CV

This solves the mistery about my long debated "plucked" response on certain presets.
What do youthink of this discovery? could it be recreated as an encoder into a whatever keyboard??
M

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