[Fpga-synth] Expo release

[Eric Brombaugh]

In honor of getting my taxes wrapped up, I took the afternoon off to 
play with synth stuff. I added an expo release to the ADSR in my 
ARM/FPGA synth and put a few samples up in my directory at SDIY.org.

Find them here:

http://www.sdiy.org/kbadc/armfpga/

Descriptions:

fm.mp3 - this is playing around with the 2-op FM waveshaping. You can 
hear changes in the mod/carrier ratio as well as the mod index. Note the 
rather strong clicking as the mod/carrier ratio is changed, while 
sweeping the index is much smoother.

gong.mp3 - this is a high and low gong sound to illustrate the 
exponential release.

delay.mp3 - this is playing around with the regenerative delay / 
feedback feature.

Let me know what you think!

Eric