Can i connect two h9 via bluetooth on the h9 control app on my mac, i cn only seem to connect one at a time
Generally speaking, you should be able to connect two H9s to a Mac. If you are having trouble, you may want to try some of the trouble shooting tips described in H9 Control's manual like for example resetting the system settings on the H9 that won't connect by turning it off and then turning it on again with the right footswitch and the HotKnob switch pressed (the switch in the upper left hand corner of the H9).
https://s3.amazonaws.com/com.eventide.downloads/Product+Manuals/H9ControlManual.pdf