I was trying to load my dx7's sysex to load into my PC4 & was having a bit of a problem (I was trying to port the sysex to the PC4 by midi) ,got a bit frustrated , & then downloaded Dex librarian /editor & preceded to load 1,023 dexed FM programs to my thumb drive ,then dumped these dexed programs into the PC4 & wow just wow! 10;s of thousands more. WWHHEEeee