So, for instance, if I want a wait on one blast, it would whistle, pause, then say "wait"?

If he waits for the voice signal, after he has already set off back to me (which is what he will do atm) would you praise that, or keep going til he was waiting on the whistle?

I would praise the wait as of course he did, just a little later than you had planned.

Thank you, I'm going have fun this weekend. Sadly I am covering holidays, and have to work all this week. (Well, turn up anyway )