the PL trigger voltage seems to force BL1611 into audio mode.
Seems logical since this is why a powerlink was fitted to the converter, to “tell” the masterlink source, audio was started localy from the AAL side.
which is only then cleared with a power cycle.
This is less logical. Or maybe not: the converter was meant to be connected to a Video AAL or Audio AAL, but not both at the same time. Then without Y splitting adapter or similar in which scenario would the converter need to revert to video mode after have been triggered by Powerlink?