Hi I have a TR606, MC202 [both use SYNC24] and a load of MIDI gear.

My MC202 is triggered via MIDI to CV.
The TR606 is synced via an 8 way MIDI thru box I got that also has a SYNC24 output. I can't remember where I got it but I found these links to sites you can buy similar stuff from on the internet:-

US: http://members.rogers.com/dinsync/about.htm
UK: http://www.philrees.co.uk/products/sync-if.htm
UK: http://www.emismusic.com/doepferconverters.htm

Or checkout http://www.analoguesolutions.com/ - They sell the Kenton convertors (MIDI to CV which also have DIN-SYNC24 outputs) and also do lots of funky modifications - They will even fit an internal MIDI sync into your TB303 and also do lots of other mods like allowing extra CV inputs to control the filter, etc. and will even replace the red LEDs with blue ones!!!

I'm gonna save up and get my 606 modded by these guys so I can have full tonal control, trigger the drums via MIDI and have blue LEDs!