Tr-505 Midi Signal slave blah blah

So I use a lot of drum machines + synths, samplers etc. all sync'd with midi I use FL to send out the main clock and every thing else follows and resends etc. I want to have my 505 on slave mode, but it will only start when it receives a start signal, is their a specific note that does that? I haven't tried doing every not that my midi can send yet (haven't hooked it back up in that mode for a little while) Just thought maybe some one on WATMM already knew. Or if they knew another solution that wouldn't require modding/more equip.

should just work when it's set to sync to external MIDI clock surely? is it set to the right MIDI channel?

yes, in the tr-505 manual it says if you set it to slave mode it HAS to be sent it's start and stop signals, you can't just turn it on/off on your own. (ANNOYING!!)

And I think FL sends a constant midi-signal so It doesn't really tell to it start I guess, not sure.

When you hit play in FL, it will start the pattern on the 505. If you don't want the 505 to start right away, just set it on a plank pattern first, and then switch it to your programmed pattern(s) when you want it to play.