All 25 amp presets on BIAS Head/Rack are assigned to MIDI Program Change numbers from #0 to #24 , which means you need to un-map the current MIDI PC# slot and assign it to a different MIDI PC number to get it work. Here's how:
1: Connect BIAS Head/Rack to computer/iPAD/iPhone via USB/Bluetooth.
2: Select MIDI Settings in Settings Menu.
3:Select Program Change Tab.
4:Choose an amp preset and assign it to a different MIDI PC# on the dropdown menu.