Halting a sequencer

Hi,

I’m trying to manage several sequencers from some manger component (I have pointers to them). the main thing I cant find is how can I ask a sequencer to stop sending requests to driver, no matter if currently it has items to send or not. kind of a flag saying the sqr ‘stop sending requests until its flagged off’
grab will give me this option only if I have items in the sqr queue, but not quite.

I fill I’m missing something in the understanding, is there any control on the sqr/driver bond that gives me this ability?

thanks for the answers
Uriel