Simply use VST expression Map, you can find the Koontakt VSL library expression map here : http://download.steinberg.net/downloads_additional_content/Expression_Maps/Native_Instruments/Native_Instruments_Kontakt4_VSL_v1.0.zip
Simply use VST expression Map, you can find the Koontakt VSL library expression map here : http://download.steinberg.net/downloads_additional_content/Expression_Maps/Native_Instruments/Native_Instruments_Kontakt4_VSL_v1.0.zip