Douglas Susu-Mago has written a very informative tutorial "How To Use All 64 Channels With Mac-Based Finale 2004-2005"
The manual in GPO was written prior to when Finale could support all 64 channels in GPO Studio. Douglas shows you how to do it in Finale 2004 & 2005.
Thanks Douglas for doing this. This is going to be of enormous benefit to Finale Mac GPO users!