When I have several MIDI keyboards connected to my computer, only one of them seems to work with GPO4 stand-alone. All the keyboards show up in the ARIA Player Preferences and are checked. However, only one of them will actually trigger notes to the Aria Player. In particular, I have an M-Audio Keystation Pro88 (via USB), an M-Audio Axiom 25 (via USB), and an older Roland synth (via another MIDI interface). Only the Pro88 will trigger GPO4 stand-alone.
This is on a Mac Pro, OSX10.6.1 computer. All keyboards are recognized by the Audio MIDI Setup.
When GPO4 is used as a plug-in to Cubase5, all keyboards work fine. This seems to be a problem with the stand-alone ARIA player.
Any ideas to fix?