Hello,
Have you checked out the “Delays – Loops” algorithms? See page 25: https://s3.amazonaws.com/com.eventide.downloads/Product+Manuals/H8000presets.pdf
Many or perhaps all of the dedicated looper algorithms have mechanisms to open/close the loop. You can use an aux switch / MIDI CC / etc.
The Long Delay algorithm does not have this parameter, the only option you have with this is controller the level you send to the H8000 input.
Let me know if that helps.
