[Zubersoft]

You have two options: using the MIDI channel or using port filtering. If you go to Settings->MIDI Settings, you can enable sending to multiple channels. Then you'll need to select the channel you want to send each message to. If you want to enable port filtering go to Settings->MIDI Settings->Configure MIDI Connections, and switch to using Google's MIDI library (only supported on Android 6.0+ though). That library lets you choose which output ports to connect to, and when you configure the MIDI messages for your songs, you can select which output ports to send the messages to.

Mike