[sdiy] ARM/FPGA synth - now with 100% more audio samples

[Eric Brombaugh]

I've had a few months to code up a little mono synth on the ARM/FPGA 
system that I built. You can find a few updates on the website here:

http://members.cox.net/ebrombaugh1/synth/armfpga/index.html

Basically it's a MIDI controlled 2-op FM synthesizer with an ADSR and a 
regenerative feedback delay. The ARM processor is responsible for 
configuring the FPGA and parsing the MIDI data into parameter settings 
for the synth design.

I've made a few audio samples to demonstrate some of the sounds. 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