Not only is the flux density different between the high and double density disks and drives, but the HD drives lay down a more narrow track on the disk, to allow for cramming twice as much info on the same sized disk. While setting the drive to format the disk at 720K capacity will take care of the spacing between the tracks, and may help with the flux density, the drive will still only lay down a very narrow track, which double density drives, such as are in the Yamaha system may have difficulties reading.

This is akin to us older people having difficulties with smaller point type.

The solution may be to haunt a computer or electronic flea market to find a double density drive, and get a local computer friend to install it as another floppy drive in your computer; or get an older computer with a DD drive and use it to copy these songs onto the disks. This would be almost as cheap and would save messing around with your machine.

Dave