1. Why oh why is &#x27;there are 4 tracks&#x27; hard-coded into the format? What a perverse limitation. I understand there has to be a limit if you want hardware players to mix in real-time but 4 seems too low and Stem v2 will probably be needed next year to get round this.<p>2. This seems like a wasted opportunity in terms of adding extra features that wouldn&#x27;t complicate implementation terribly much. Tracks could allow time offsets and repeats - you&#x27;ve then got a loop-friendly pseudo-tracker file format at very little extra cost.