I have installed pattern expansion board and when I turned keyboard on I did not get "WARNING!!!FLASH FORMATTING" message. So I did a test to see if I could could load more than 50 patterns. I was able to load 50 before install.After install I loaded a total of 52. Surely the expansion will allow me to load more than 1 extra pattern. Ketron states that after install you could possibly load 170 on the xd9. I realize the bigger the pattern size the less you will be able to load. Has anyone installed pattren memory on the xd9? If so....how much did this increase your pattern load?. Ketron also states that you could load up to 170 patterns but there are only 100 pattern storage spots....is this suppose to incraese when you install memory? ....help please.