Kurzweil Pc3x synthesizer doesn't work with MG2 when I choose it as external MIDI track in Logic Pro 10.7.4

How can I use my vast sound library on my Kurzweil to play via guitar using MG2?
When I open the MIDI track in Logic as “External Midi” MG2 records the MIDI notes but it doesn’t play the chosen sound on the Kurzweil. Having a MIDI brain block.