I have recently taken an interest in this topic in conjunction with loading banks on Pamela’s New Workout in sync with Metropolix preset changes. If you set CV A or B to First Pulse, that could do what you want, but not if you’re using Total Pulses on your presets, for example. If you’re using Total Pulses, you will get a trigger at the A/B out every time the sequence resets back to the beginning, not just when you change presets.
I don’t ever use LEN > Pulses but apparently if any of your tracks are set to something other than Auto, this will also send a trigger to the A/B out with First Pulse. However, now that I’m reading about it more (p. 106), this part of the manual is a little unclear to me (without trying it out):
So if Global Reset is off for a Track, and LEN > Pulses is something other than Auto, apparently a trigger will not be sent to OUT A/B using First Pulse, but I assume the Track still resets though?