Cubase 12 pro halion sonic midi track

i am using cubase pro 12,on halionsonic after i using first track any instrrument like piano it sounds piano
and when i select the next midi track as acoustic bass or saxophone,on using the virtual midi piano for input ,the sound is same as piano,its not having the selected instrument sound,can someone plz guide…appreciate,with thankzz

Use need to change the midi channel in the inspector of the midi channel to correspond with the Halion slot you are trying to play ie slot 1 /midi channel 1 , slot 2 /midi channel 2 ect …