I have Bandhelper running on both a PC and an IPad. Is it possible to run a show via the IPad and have that send remote control messages to the PC so that it plays the recordings I have loaded on the PC.
Do you mean send MIDI messages from the iPad to some software on your PC that can receive MIDI messages and play recordings? Yes.
Do you mean send MIDI messages from the iPad to the BandHelper web interface running in a web browser on your PC? No.