I'm sorry for the double post, but I found the problem. For some reason, on the the SYNTH END statements was replaced to somewhere where it shouldn't be. I think that confused LSynth...
Stupid though, that I never saw that before.. It gets so confusing when you have so many LSynth parts in a model.
Stupid though, that I never saw that before.. It gets so confusing when you have so many LSynth parts in a model.