Originally Posted by toaddub

ok, I read it wrong.

Change VTS1/PGC3, R[4]=4; VTS1/PGC5, R[4]=3; VTS1/PGC4, R[4]=5.

With Pro 3.4.1, there are new buttons in the toolbar, Run Debug and Step. Once in debug mode, you can stop playback, watch registers change, apply break points. It's not fully completed yet, but it's getting there. It should be enough for you to simulate playback. Are you not using this version?