In article ,
fred wrote:
The ramp time delay is R2*C1 seconds.

Not quite sure what this is, mathematically speaking. Is the * a symbol
which has come out wrong on my browser?

Basically, I'm after a fairly slow fade - perhaps 3 seconds from min to
max.

--
*All generalizations are false.

Dave Plowman London SW
To e-mail, change noise into sound.