[Fpga-synth] Linear / Expo Release for ADSR Working

[Eric Brombaugh]

Scott Gravenhorst wrote:
> Have a listen:
> 
> http://home1.gte.net/res0658s/gatemanpoly_bell_lin_expo.wav
> 
> This is a sample of two strikes of a bell sound, the first uses linear release, the second uses
> exponential release.  There is a marked difference, especially near the end of the fade out.

That's what I wanted to hear! Amazing how much difference that long tail 
makes.

Eric