can't do fade-outs, fade-ins and crossovers for instrument tracks

Hello there,

Love Cubase, but just having a learning curve with the latest version, Cubase Pro 10. I am recording instrument tracks with the included VST instruments of Halion etc. but on instruments tracks I can’t set fade-outs and fade-ins with the standard Audio fade editor or the Project range selection method. What am I doing wrong? Please help.