LG Glimmer / UX-830 / Vantage / Spyder
Download and install the LG 8600 Drivers
Install the latest version of BitPim
Let it find the phone(it will come up as other CDMA phone)
Click FILESYSTEM on the left at the bottom
Expand the folder
Right click on lg_mysound.dat and save it to your desktop
After you save it right click lg_mysound.dat in bitpim and delete it
Now click brew
Now drop the songs you want to use as ringers in this file. They will automatically load into your phone. It inst the fastest process but it works.
After they are done loading onto the phone, unhook USB cable from compute...
If you're looking for just adding custom ringtones I'd suggest using the website Myxer.com. It has a large variety of photos and ringtones that are sent via MMS (picture message) that you can then store and use as ringtones. The site also has videos and games that our network doesn't CURRENTLY support YET ;)
Hope that info helps you out!