the problem is the pyramid has both midi and dinsync out. and there is a constant voltage on the “reset/fill in” pin of dinsync (that a lot of devices don’t use)
the 303 however uses this, so to fix this you need to make a splitter cable to split dinsync and midi from the midi out B port. There is no software fix as the problem is hardware related.
For this reason I created a cable. In think Squarp should make mention of this on the website and/or provide cables for this. In any case, here you go, I hope this information is helpful to you.