how to sent .wav or .mid files to my 7650?

Hi, first connect your 7650 to your computer via IR, and after this choose a midi file from your computer, right click with the mouse, and select "send via infrared" or something similar. Then you�ll receive a SMS in your phone with the midi file.
Try it.

By the way, if you are using Bluetooth, I can�t help you, since I have not a Bluetooth connection 😉

or alternatively find an email account where you can get hold of their pop3 settings, so prob an email account from your ISP.

Define and setup a mailbox

Send yourself, from another email adress, or just send it to yourself through outlook express an email with the attached .wav or .midi and then just download the email through your mailbox on ya phone and goto options > view attachmenets and then Save

of course using GPRS and wap or what not to retrieve the email will cost you but if you dont have an IR or Bluetooth device then hey, its all ya can do.