I read that N7650 supports polyphonic (MIDI) ringtones. Also, it has a built-in composer.
But can it compose polyphonic ringtones?
And where have we to store composed or downloaded ringtones?
Regards!

No, the composer is still the normal composer. Just like in 9110 and 9210. Midi files can be transfered via bluetooth, Ir or email. Or even downloaded from internet.

They are stored in the file system. And can be backed up and restored with the help of PC suite.