The original delay code, was setting it read index relative to the length
of the delay. This fixes that, now when the length is changed the read
index stays in the correct place in the buffer.
The delay time paramter was responding very badly ui user input.
This now has a much more plesant sound, not dis simular to a
record being sped up or slowed down.
Added Sample exactness to the following parameters
Delay time
Regen
Lfo time
Lfo amount
Did not add this to the output gain contol, This model is used in
a dbScale, and a much more pleaseing result was gained by using an
amplifier plugin.
