The Pyramid has gate out. Wonder whether I could send a regular note pattern to Grids clock input to sync the two.
Yes, it’ll work. You can send 16th notes and configure Grids to a resolution of 4ppqn. Or go one step further (32th notes / 8ppqn).
You can use another channel with a short note at the beginning of the bar for the RESET input (and if necessary offset the first note on the clock channel by a tiny amount, so that the RESET pulse is received first).