[gcbartlett]

Yes, Aesop, I suspect your problems are caused by differences between Bongos2 (and the unmodified by Mazzle Bongos1) and the Mazzle-modified Bongos. With the unmodified versions of Bongos, the maximum size of all bars are the same, and the maximum number of buttons is 120. So you can start out with 10 bars of 12 buttons, or 12 bars of 10 buttons, etc. Once the no. of bars / maximum size of the bars has been established, individual bars can be resized smaller (but this eliminates the extra buttons - they are not usable elsewhere). I believe that the Mazzle modifications to Bongos modified this behavior so that bars can be different lengths without losing buttons, and hence is more efficient in its use of the 120 buttons.

It's possible that you won't be able to exactly reproduce your Mazzle-Bongos layout. In your situation, Aesop, you could try choosing the maximum bar size that gives you the right number of bars you need + 1, and then stick the additional bar to the right of your main bar (individually resized to give you your total of 13 buttons).

Worst case, you could always define 120 bars of 1 button each, and then individually position each button (use the sticky buttons in this case to simplify positioning) to make 'bars' of any length.