Yamaha DX7 Sysex Transfers Procedure
Set your DX7:
Button "FUNCTION" then button "8": set MIDI CH=1 (data entry slider or button "YES")
Button "8" again: set "SYS INFO AVAIL" with button "YES"
Button "INTERNAL MEMORY PROTECT": set to "OFF" with button "NO"
Transfer soundbank to your DX7:
Run your sysex transfers program on your computer and load or open (depending on the program you are using) the sysex file you want to transfer
Choose "Sysex send" (or the appropriate option) on your sysex transfers program
You must then see "MIDI RECEIVED" on your DX7/TX7 display (transfer OK)