I actually use phonezoo.com It may not be the best audio quality but it works fine for my phone and it's free which is the best part of it. It's really easy to edit your songs too after you upload them to the website. HTH and I'll answer whatever questions I can about it if you have any.
I use Audacity on my Mac. The program is great and I proabably don't even know how to use a tenth of all the options you can play with on it. It's easy to use, and I just use the option of "saving the (completed) file as a WAV file", then drag it into my Itunes, and then use the OPTION of converting it to an MP3, then drag it onto my BB, into the ringtones folder, using my USB cord.
I've probably created over 300 custom ringtones of any sound, or song, or music that is out there.
It's very easy to do, it's just a matter of playing around and doing it, and/or hooking up with someone who can help you cut down on all the expermentation time. PM me if you need help.
I agree with scis30. I use garbage band that is already preinstalled on my macbook.
I just drag the song I want to use from the right side of garageband from my itunes. I shorten the lenght of the song to where I want to ringtone, and i also used the fade method to fade in and out. Export it as a mp3 and I transfer it via bluetooth or usb/sync (now that there's a desktop manager for mac's)
this normally takes me about not even 10 min if I know what song I want and what part I want chopped out
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