You should be able to use the free Blue Cat's Gain Suite Win/Mac loaded into the Combo vst slot,
in a midi track you can load Insert Piz midiOut.dll Win/Mac, set it to LoopMidi then set Biab MIDI Input to LoopMidi, now set the CC volume fades/pans in the midi track.

EDIT: or have a look under Options > GM Settings > Master (Combo) Volume Adjust...