Pretty straight forward. But we just had a really small project.

Yes, as mentioned, just 4.5.

• what effects are available for the N900 (at the moment at least)?
• how do you go about using effects?
• what is the performance like, that includes the number of files that can be played simultaneously along with effects of sort (bearing in mind the application would also be running an interface, not just in terminal)?

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Phonon is just a wrapper for gstreamer. This means that the performance, latency is totally dependent on that, so that it is not possible to give Qt specific information here. Please follow for that the Maemo5 developer documentation and the gstreamer pages directly. But my advice would be to play a bit around with it, based on the Qt and gstreamer docs, and if you have specific questions, post them here and we try to help you out.

Daniel