Finale 25 offers 8 different Midi Channels for assigning per bank.  Yet when you have used 7 channels and go to add the 8th, you get an error saying out of midi channels.  The workaround is to add another part and then go back to the part you're trying to add the 8th channel, but this appears to be a glitch that needs to be fixed.  I'm running Finale 25 on Mac 10.11.1