I'm quoting from the FAQ:

"Does Groovyband Live! produce the sound as well as the realtime arrangement?

No. Groovyband Live! produces only a stream of midi data. You need a compatible sound generator to actually produce sound."

This means, a saxophone sample of an older PSR arranger will always sound like exactly that sample of the older PSR arranger, and never like the newer sample of a Genos, nor will it have the SA2 features of automatic slides etc.