As a note to anyone having issues with their Perf/X units, I wanted to report that I was successful in getting my Strummer to accept the Drummer EPROM I burned. However, afterwards I was having difficulty with the unit crashing. At first I thought it must be something with the EPROM, but I read over on Gearslutz that the Perf/Xs need clean, stable power to operate properly. So I measure the voltage coming from the stock wall-wart, and I was quite surprised to find that it was spitting out over 14 volts. I then switched to a spare requlated 9v wall-wart, and all the issues I was having disappeared. My unit now syncs to midi clock beautifully and doesn't crash randomly.