I?ve tried to create my own warning and alert sounds with limited success. I make the sounds, save in .ogg format and load them into the TomTom sounds folder.\r\n\r\nFirst question is WTF are the .tlv files? Most of the sounds the TomTom ships with appear to be associated with a pair of files - an .ogg and a .tlv file. Obviously, the sounds I am making are just .ogg files [or .wav files].\r\n\r\nSo a couple of the .ogg files I made work fine and similar ones don?t work at all. I have no idea why? Anybody got a clue? Are they too long or too big perhaps? (I?ve tried playing with the file names but that's not it.)\r\n\r\nAlso for reasons I don?t understand, when I go to choose one of my new sounds in the TomTom, I get two names - a .filename and a filename. Only the filename ones work [sometimes]. So what are the .filename options?