So, for example, if I want to call up my sound "Sonata" (which is strings+oboe+harpsichord), which is in Sound Memory "slot" #13, here is what I do. I am using MIDI channel 5 here, so the "4" is for MIDI channel 5 (1-16 is 0-15 in here!)

B4 00 10 C4 0C B4 00 20

B4 = Bank change coming on MIDI Ch. 5
00 = MSB coming
10 = MSB value of 16 in Hex
C4 = Program Change coming on MIDI Ch. 5
0C = Pgm Chg 12 (For sound 13) (subtracted 1)
B4 = Bank Change coming (so I can reset it)
00 = MSB coming
20 = MSB value of 32 (used for most internal sounds)

Hope this is useful to someone!