Is there a way to add system sounds? I don't want to put them on my SD Card because I often have my phone charging while connected to a PC(and set to mount the SD Card). If I choose a ringtone using an app like Zedge it works great.. until I plug the phone into a PC. Then if someone calls me instead of getting my new ringtone I get one of the default ringtones. Obviously this is because the SD Card is not available for the system to retrieve the file. I'd like to be able to add one or 2 ringtones/notification sounds so I can have a decent ringtone even with the SD Card mounted. I've searched everywhere but I can't find the location of the sounds nor how to add them except via the SD Card. Any ideas?