If you're able to load and preview files in the Wave Manager Software, but not able to transfer them to the SPD-SX, it's possible that the USB Mode in the SPD-SX is set incorrectly.
Confirm that the USB Mode is set to "WAVE MGR" with the following steps.
- Press MENU.
- Cursor to "SETUP" and then press ENTER.
- Cursor down to "OPTION," and then press ENTER.
- Cursor down to "USB MODE."
- Press the (-) button to select "WAVE MGR."
- Using the SPD-SX's power button, turn off the power and then on again. The new setting will be applied.