Nokia Composer format ringtones
Nokia Composer format ringtones look very similar to RTTTL ringtones, however there are a few minor differences.
Usually, Nokia Composer tones do not have commas between the notes, and do not have a header containing the tempo, or song name.
By using the Ringtone Converter to convert the Nokia Composer tone to RTTTL format you can add a song name, and tempo information, and then convert the RTTTL to work with your phone.
How to convert a Nokia Composer ringtone to RTTTL format
In the Ringtone Converter select the 'File' menu, then 'Standard phone tools', then 'Import: Nokia composer format'.
You should then see a window like this...
Paste your Nokia Composer ringtone into the large white box, enter a name for the tone, and select a playback speed (140 is a good starting point) then click the Convert to RTTTL format button.
If you find the converted tone plays too fast, simple reduce the tempo or playback speed. If you find it plays too slow, increase the number in the playback speed box.