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Check out the Benjolin Light Synth <a href="http://casperelectronics.com/finished-pieces/benjolin-light-synth/">HERE</a>.
I've started playing with the echo module built into the synth. It's based around a modified 1980s era BOSS RSD10 SAMPLER/ECHO. The sampler has a trigger in and a frequency in. I'm using the sequencer clock to trigger the echos and th output of oscillator one to control the pitch of the echo. 