Polyphonic tones

What differences are there between polyphonic ringtones? Older Nokia's are 16 chords, and I heard 6230 is 24 chords, but some newest are 40, right? Is there much difference? And what exactly are MIDI tones and TRUE tones? __________________ read this, http://www.mobile-review.com/forum2/...ead.php?t=9483 and i add, 4 - 16 -24 - 32 etc are the channels/chords that can play at this same time. Mavi forum