One of the things that initially attracted me to Logic was the ability to enter my own patch names into the Instrument objects within the Environment. But, for some reason that has never been adequately explained, it's not possible to create more than 15 banks of named patches per instrument (0 to 14), even though you can select any of 126 banks from the track Parameters box in the Arrange window. Most people don't find this too much of a limitation, but if you're using an expandable multi-timbral sound module then it can be a real problem — selecting bank 15 and typing in new patch names will overwrite those assigned to bank 0.
Fortunately, because the patch names of banks 0 to 14 are reused for banks 15 to 29 and so on, there is a way to work around the problem. What you have to do is to create a copy of the relevant Multi Instrument object every time the original one runs out of banks. Give each new object a slightly different name and a different-coloured icon to differentiate it from the original — to change the object's colour, highlight it in its entirety in the Environment window by clicking its header icon, select Object Colours from the window's View menu, and then select the colour you want.
To access a bank above number 14, assign the new Multi Instrument to the relevant track and select the bank you wish to access from the track's Parameters box in the Arrange window. You still can't select the bank directly from the patch names window, as this refuses to go beyond 14, but I did say that it was a workaround, didn't I? Paul White