Is it possible to either delete or change the annoying "vroom" sent message tone? I have tried and looked everywhere and can't find anything! Please help
That only works for mail not text.
I think you would need to find the sound file itself using SSH and either delete it or you may have to replace it with a 'blank' tone...
Have you resprung your phone since deleting it? Or try replacing it with a blank sound file.
SSH is just a wireless way of acsessing the iPhones file system on you PC. You need openSSH from cydia and a programme like winscp on your PC or cyberduck for mac...