Hi again. Happy you got the PC thing working.
However, I have just discovered that I made a slight misreading of the manual of the Synth Lite II.
In a polyphonic mode, the Synth Lite II allows for up to five units to be cascaded in series, with one note played by each, by holding one button down while powering the unit on. This works in the following way:
Power on and holding Octave OSC 1: Monophonic (i.e. the normal setting)
Power on and holding Waveform OSC 1: two-note polyphonic; one synth plays every other note
Power on and holding Octave OSC 2: three-note polyphonic; one synth plays every third note
Power on and holding Waveform OSC 2: four-note polyphonic; one synth plays every fourth note
Power on and holding Glide: five-note polyphonic; one synth plays every fifth note <–My mistake!! Now your synth only plays every fifth note it receives!
In other words: If you power the Synth Lite II on and hold Octave OSC 1, everything should work normally again.
Then, while the synth is on, press and hold RECORD and press Glide and set the synth to send/receive both PC and CC by setting the display to ‘3.’
I am sorry for the confusion my mistake has caused you. I just discovered it when trying this out myself and ending up in the same embarassing situation. The Synth Lite II certainly has a lot crammed into it for its size…