The Ketron SD 2 provides voices as follows:

A Voice Bank=MSB Bank 0, LSB 0. This is the GM Standard Bank.
B Voice Bank=MSB Bank 0, LSB 1.
C Voice Bank=MSB Bank 0, LSB 10.
Presets Bank=MSB Bank 0, LSB 2. These are specially developed sounds, with effects etc.

You need to copy the Patches.ini File you have obtained from PGMusic and paste it into the file of the same name in RB and/or PTW folders. When the program is next opened then screen messages will appear to advise that the file has no errors and has been accepted by the program. Go into Options > Patch Names and select that for the Ketron SD 2.

The best way to apply these Patches to the Ketron is to open the Classic Tracks Window where you will see a column Prg which should show the Program number and name of the Patch you have selected providing that the Column Bank (which is the MSB number) shows Zero and the column LSB shows the the LSB code 0, 1, 2 or 10. The Drums are applied as MSB 0, LSB 0 via channel 10. If your Patch List is corrupted or not selected correctly then the Ketron will still work from the entered Program Numbers, MSB and LSB codes only.

I hope this assists.