I have not done any MMS development. I am researching what can be done with sound in MMS.

what kind of sound/graphic synchronization can you expect from MMS? For example, could you have a simple animated character's mouth move in sync with a short recorded voice message?

are there any forms of interactivity within MMS that might involve sound, or are MMS message generally a linear presentations with little or no interactivity?

My understanding is that AMR and sp-midi are the most commonly supported audio formats for MMS, but series 60 with Beatnik audio engine can play RMF too. No support for mp3 at this time?

thanks for any info.