The Allen wrench does the job on the cleat-angle adjustment - this non-Harken block is the same as that for the Getaway as far as I can tell. I don't see any adjusters on the central ratchet cog to control when/if it engages, so it looks like a permanent non-adjustable ratchet externally (I don't plan on totally disassembling the block to see if there's an internal adjustment)!
If it's like the Harken ratchamatic, the ratchet engages automatically when the sheet is under tension. On the triple, there is a hole in the middle sheave that you line up to access an allen head underneath to adjust the tension at which the ratchet engages. From Harken's website....
How do I adjust a Carbo Ratchamatic to engage the ratchet at a higher or lower load?
To increase or decrease the load at which the ratchet engages, first, move the sheave so the hole in the sheave’s groove is at the bottom of the block. Insert a 2.5 mm Allen wrench and turn clockwise to engage at higher loads and counterclockwise for lighter loads. You will need to remove the becket before adjusting if it is a becket block.