Can anyone point me to an editor where I can create RNG files suitable for a Series 60 phone? I only want some very simple sounds.

Right now I use sounds that are shipped with the phone, but of course these change from phone to phone so I shouldn't rely on them (BeepTwice.RNG was included with earlier phones, but isn't on my new N70, for example).

My experience of palying WAV files on UIQ was not very good (they play very quietly in my code despite setting the volume) whereas RNG files on the S60 are fine, so I'd prefer to stick with this format if I can.