Thanks for trying it. You should be good to go if you changed your settings in OBS. I'll need to do some tweaking to get it automated.
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Been A while since I set up my mame cab but my HTPC has many emulators some using MESS and I just used the Wait to send key feature to by pass the screen.
I do not remember if the integrated MAME feature of GameEx has these parameters.
The wait before is hoe many seconds to wait before sending key 1sec + 1000