We maybe have to go deeper.
1) Does the MIDIclock out work for you under any circumstances ?
2) Have you tried it with the other effects ?
3) What exactly does it not do that you expect it to (i.e. define work).
Some side issues (sorry if these are obvious) – have you made sure that:
1) You are using the latest S/W version ?
2) CLK OUT is set to ON ?
3) OUTPUT is set to XMT ?