Nope,but many years ago i did build a Syntom.
This i put together whilst at work,in between the manufacture of Studiomaster mixer channels on a wave soldering machine that insisted on flowing molten lead over the boards,there was a lot of reworking to be done...
Details on the web are sketchy and i lost it after the guy who borrowed it lent it to someone else,my Amiga Sampler was also lost similarly.
Here is Edgar with a related DIY product.
http://www.bigbluewave.co.uk/synclock.htm
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