My Anni has the external trimmers on the psu so no problems adjusting speed if required.
I assume yours has the internal trimmers so if you can locate them it should be an easy job to adjust the speed, someone on here will tell you where they are.
Not sure about the Heed Orbit on an Anni but i've used one on a PT Too with dead electrics, fitted a Rega psu board to the original PT motor and then fitted the Heed, works a treat

.... and 33/45 at the push of a button.