LINKvia Eric on the SDIY list:
"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.
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"
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