[sdiy] Updated VCLFO now with wave distortion CV input

[Tom Wiltshire]

I've updated my PIC-based VCLFO project.

http://www.tomwiltshire.co.uk/sdiy/lfo.html

I've added a WAVE DISTORT CV input which can morph a triangle wave into 
a ramp up or ramp down (or similar for other waves). It uses phase 
distortion in a rather similar manner to the Casio CZ synths, except at 
LFO frequencies (this is a PIC, after all...).

I've also added a SYNC input, which everyone seemed to think was a good 
idea. You can reset either LFO wave cycle or the S&H clock or both. 
Note that the SYNC input is set up as a hard-sync reset, rather than a 
replacement clock. This way of doing things has some advantages and 
some disadvantages - like most other ways of doing things!

Please have a look - any comments appreciated.

Tom


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