Preset Button Index
When a new bank is selected, the Mastermind has to decide which preset is assigned to each preset button. It examines the buttons in a specific order, and assigns the first preset in the bank to the first preset button it finds. The second preset button it finds gets the second preset in the bank, etc. The order in which it scans through the buttons depends on your device:
Mastermind GT - starts in the upper left corner, and goes from left to right. When it reaches the end of a row, it goes down one row and starts at the left side of the row, scanning to the right again.
Mastermind LT - starts in the lower left corner (the 1 button), then scans to the right. When it finishes that row, it goes up to the Bank Down button, and scans to the right again. Finally, the Function button is scanned.
Mastermind PBCPBC/10 - starts in the lower left corner (the 1 button), then scans to the right. When it finishes that row, it goes up to the Switches button, and scans to the right again. Finally, the Loops button is scanned.
Mastermind PBC/6X - starts in the lower left corner (the 1 button), then scans to the right. When it finishes that row, it goes up to the Functions button, and scans to the right again.
Order Reassignment with Preset Index
If for some reason, you want to change the order of how presets are assigned to buttons, you can do this with the Preset Index setting found on Preset buttons. By default, these are all set to 0, which means that the standard order (as described above) is used. If you assign different Preset Index numbers to the buttons, the presets will be assigned in that order - number 1 will receive the first preset in the bank, number 2 will receive the second preset in the bank, etc.
If you need to assign a button that accesses a specific preset regardless of which bank you're in, you can use an IA button with a System / Preset action.
For more information on Preset buttons and the Preset Index setting, please see Mastering the Mastermind Episode 6, Button Editing part 1, and Episode 7, Advanced Button Editing