Restarting/Syncing the Sequencer

I have the sequencer controlling a volume block in the HX Stomp to create a rhythmic stutter/slicer effect.
I’m having trouble syncing this to my playing.
I was hoping I could set it to stop-on-press, start-on-release so I could press/release that on the downbeat to sync the sequencer to my playing.
It doesn’t seem to be working. Is there a latency involved with starting and stopping the sequencer? Or is there another way I should be approaching this?