I don’t have a Grandmother, but I have measured my Matriarch and I would speculate that the circuits are the same. Unfortunately, the envelope design is not very good if you care about short timings. The old-school analog circuits used in these synthesizers depend on custom potentiometers ...
Regardless of votes or topic or how bad you think the question is, posting the comment "please close" to ANY QUESTION is a bigger waste of bandwidth than the question you'd like closed, close it yourself, if you don't have the rep, down vote it. The entire point of voting is to a...