The new helix stadium XL has a user menu for presets that will go up to 511. Is it possible to make the presets in the app go higher than 127 in order to select any presets on the user menu of the helix that are higher than 127?
You need to use a combination of bank MSB or LSB numbers and program numbers. The user manual for your Helix should explain how it uses bank numbers to select additional MIDI programs. Some products use the MSB field and some use the LSB field.