Thanks for the quick response!!
Don't think that it responds to song number however it does respond to Program Changes. Heres how Mainstage refers to it in their manual:
When you add a patch to a concert, the patch is given a MIDI program change number (the
lowest available number) until all available program change numbers are taken. You can select
patches using program change numbers in performance by assigning buttons on a MIDI
device to send program change messages. The program change number can be edited in the
Patch Inspector.
To select more than 128 patches, you can also set the bank number for a patch.
You can reset program change numbers for all active (non-skipped) patches in a concert. When
you reset program change numbers, patches are assigned program change numbers based on
their order in the Patch List, starting from the top. The program change numbers for skipped
(inactive) patches are not reset.
To select patches by bank, first send the bank select message, then the program change
message
Since each patch within Mainstage is given a number can I attach that number in SLM so that it call is up properly?