What is the v2.8 equivalent xrns for TrackMixerDevice?

I’m trying to edit my v3.0 song file so it might work in v2.8, and I’m struggling. What is the v2.8 equivalent to “TrackMixerDevice”? What do I have to replace it with when I do a find/replace? What are the syntax changes, if any?

http://kizzume.com/files/9years.xrns

I think you need this XML variable name to replace it with:

SequencerTrackDevice