Guide
Things you'll need to prepare:
Step 1: Lanch the 4Media iPod to PC transfer
After you have connected your iPod Nano to PC, run the 4Media iPod to PC Transfer. The information about your iPod will be displayed, including type, capacity, version, serial number, and format, will be shown on the main interface.

Step 2: Adding music files to iPod Nano
Choose the music files from your PC folder. You can click the "Add files to iPod or iPhone" button, and choose the Add Files to List option that the button shows, and then locate the required files to your iPod/iPhone. (Note: In the Trial version: Batch processing function supports at most 100 files. When exceed 100, only one file can be processed each time)
4Media iPod to PC Transfer can support: AAC, MP3, AIF, M4A, M4V, MP4, MOV and WAV.

Otherwise, you could also choose the Add Files to List option from the File menu, and then locate the files you want to add to your iPod/iPhone.
Step 3: Process of adding music to iPod Nano
Before you add music to iPod Nano, you should check the music files you have chosen. After checking your files, you can start adding music to iPod Nano. Below interface is the process of adding music to iPod Nano.

Step 4: Finish the process of adding music to iPod Nano
When the process of adding music to iPod Nano completed successfully. Below interface will pop up, it means that your music have been added to your iPod Nano.

That' OK. Then you can enjoy the favorite music on your iPod Nano anytime and anywhere!