Well, "all the MIDI connection really does" is light up LEDs in the optoisolators, if your driving source has enough current available to reliably light two of them -- and most should and do, we're talking maybe 20mA max per LED -- then there really shouldn't be any problem in paralleling like that. Not a circuit problem anyway, but as you say, attempts to use a MIDI Y cable to merge MIDI data are another story entirely, for other reasongs.


--Mac