Ok so I found this on another site so I'm not sure if the mods here will appreciate me posting the link or not, but I couldn't find anything on here regarding how to create your own ringtones and putting them on the LG Fusic, so I found another source and got the how to. So if you're looking, here is the link with a step-by-step instruction (and it's extremely simple)
Here are the instructions and then I have put the link to the original post.
1. Get the USB driver from Sprint. What you want is the "Sprint PCS Connection Manager for Phone as Modem/USB Cables." The only part you need to check to install are the LG Drivers. (Can be found at "Download Software" when you log into your Sprint account)
2. Get BitPim from
Welcome to BitPim. It doesn't fully support this phone yet but that's ok (I hope it will soon though so we can all edit the calendar, contacts and other stuff). Install, run, and in the menu under View, select View Filesystem.
3. Now grab your phone and open the Music Composer under Tools. Choose Compose Melody, and pick a mode. It doesn't much matter since we're replacing this file anyway, but I've found that Keyboard Mode is quick. Throw in something short (1 note will do) and choose Save. Pick name for the song you'll replace this with, and get creative because you only get 21 characters. You can make a batch of these to replace if you would like.
4. Back to BitPim, connect your phone to your computer using the USB cable that came with it. In BitPim's Filesystem view, find the MelodyComposer folder under the root directory. You'll see a .pmc file and a .mid file for each melody you compose. Select the .mid and right click. Choose Overwrite, select the mp3 of your choice. I suggest you make it a 64kbps mono file for space considerations, but I've had success with other files. Large files also take a very long time to load over this connection.
5. Set your ring tone under settings. The files you loaded will appear under My Melodies using the filenames you gave them.
DIY: MP3 Ringtones on LG LX550(FUSIC) w/ BitPim - Phonearena.com Forum