Could somebody please confirm the variations in audio engines in Nokia polyphonic phones. ie:

Do the 3510, 3510i and 7210 use the same 4 voice poly engine?

The 7250 seems to use a different 4 voice engine than the 3510 - Similar to the 24 voice 3650 but with fewer instruments. Is this correct?

What of the other poly handsets: 5100, 6100, 6610, 6800, 7250 ? Which do these use? Are there any other variations or poly handsets we should be aware of - (Either currently available or coming soon)?