How can i delete/manage droid system ringtones? pls

[bubbles4711]

I have a LG Doubleplay from t-mobile. i downloaded zedge's app from the android market and started setting up my tones. i accidntly pushed the button that said 'set as android system tones' or somethings simular, i can't get it to pop back up. now the tones i delete from zedge stay in my ringtones list but the connected media file is gone after i delete it so it gives me the default android tone instead. this is driving me nuts. i didn't know it would do this and i have dozens of broken tones in my ringtones/notifications lists that i now have to scroll through :'( can anyone help? where can i find the folder with the system's ringtones? how do i get them off my list...i've already tried a factory data reset.