Question usuing Media Monkey
Add songs to iPod shuffle

I have a 1 gb iPod shuffle. I have just gotten media monkey gold. I had about 150 mp3 on my iPod before I got media monkey. I wanted to add about 75 mp3 to the iPod. I ripped the 75 mp3 using media monkey. I made a play list of the 75 mp3 and named It. I plugged the shuffle into a usb port opened the playlist I had made. I hilighted the songs in the playlist.
In the drop down list I choose send to iPod shuffle. The progress bar at the bottom of the media monkey interface showed new song being added to the shuffle. I clicked the iPod icon all 225 mp3 showed being on the shuffle. I unplugged the shuffle from the usb port in the normal way. When I went to play the shuffle only the new songs were on the player. The first 150 mp3 I had before using media monkey were gone. I don't keep mp3 on my computer. This is why I didn't use the auto sync feature. I thought that if I added song manually I would avoid this problem. Please tell me how I need to add mp3 to the shuffle so I can avoid any of the same problem in the future. I am new to the software and really need some help.
Thank You

Media Monkey has a great resource in their wiki for learning how to use its product with any Apple device, including your Shuffle.

Once set up, you will be able to use your Shuffle as you want.