[A6] 1 ms increments on Env's

[analoguediehard at att.net]

> Is there a way to increment the envelope times by 1 ms?  Mine go up by 2.

Nope.  There's no option to get 1ms resolution.

Some quick math: A6 parameters are 14-bit.  2 raised to 14, then times 2ms
resolution returns 32.768 seconds.  2ms to 32sec is the full range of the EGs.

To get 1ms resolution while retaining the 14-bit width, you'd chop the range
in half so the max EG time is 16sec.  I'd prefer the current implementation.

Once you get above 200ms, a 1ms resolution would be insignificant anyway.

MC