[CM] new-effects.scm : too low resolution

[Bill Schottstaedt]

 > Hi, I want to use the Gate effect in new-effects.scm in Snd
 > but the resolution of the threshold is too low for my
 > needs : 0.00

I think the "gate amount" represents the sum of 128 samples,
so a value of .02 would mean the average sample in a squelched
buffer was .00015.  I think you could change the upper bound
in the code from 5.0 to 1.0, or whatever.