Let us know if this works. I have my doubts. Typically, a unit with a TO HOST connection, like the E-423, is set up as a SLAVE unit and is not normally provided with the necessary circuitry for data flow control nor an operating system for handling a file system. These functions are normally provided by the HOST device (computer or other device with an appropriate operating system).
Good luck !
You were right..it didn't work, and for exactly the reasons you said, still I had fun trying. I even loaded the Yamaha program onto the thumb drive to see if THAT would work....it didn't.
I guess the only way is to get a laptop and work that way. I've actually seen that done. There's a folk group from Adelaide who do that sort of thing.
One thing I noticed loading style files from the flash memory on the PSR-E423, it takes 15 to 20 seconds to transfer it to the right place. That could be a bit embarrassing during a gig!!
Thanks for your help.