I wasn't very clear in that first post was I?? looking back at it
Yes, as a Grade II para rider, I can use my voice in moderation, and I do. Not all grades are allowed to. I think it's just I and II, but am not absolutely certain about that, and I think if your physical aids are weak, then it's vital. But I dom't take advantage of it, and I try to be as subtle as I can.
Yes, LindaAd you can use a couple of walk strides to come down from trot to halt. But I'm told that they're not so keen on the opposite. i.e halt to trot. When I go from WALK to trot on Max, just before the letter at which I want to trot, I just do a tiny half halt and ask...'ready Max??' Then he's ready, and I have to hold on to the reins and bang on the letter say....'and trot!'. But it's not quite working so well from halt. It's not bad...but I want better. And I definitely feel Max is not understanding me. Maybe what's needed is just to practice. Max is VERY kind, if he's not sure, he errs on the side of caution, so I don't get hurt.... He knows that sudden movements tend to throw me forward, but that tends to be sudden stops rather that sudden movements forwards, but if I ask ANYTHING different, he has to check with me, that I really mean it.
Thank you for sharing your thoughts with me. My riding has changed a little eml, from when you saw me on Rubi, because I'm fitter, Max is less broad about the beam than Rubi, and because Max is more responsive than Rubi. He's a much easier ride for me. I can now help a little with seat aids, and I am using those I describe for rein back, but I don't think I've been changing them for the trot forward. I think a combination of all your ideas, plus perservering a little longer is probably the answer. I'll let you know what happens.
Thank you all.