Hi,
Are you using the mp3@64 on your 1200's internal clock port? Is it running ok - do you get any playback issues (any skips, loops, dropouts etc) or is it completely seemless? Was it a direct fit or did you need to use a clockport riser or extension cable?
I'm curious as I have had a lot of issues playing mp3's using a delfina on my internal clock port and wanted to see if this was any better.