Hey !
I think you may be able to use a custom e2 event for inline multilayer parsing (a layer of parsing on top of the already existing parser) but I haven't tried it out yet. If it works, you may be able to get around it just doing that.
I think a closing tag for voices would be the most useful for multiple effect stuff (since voices can predefine other effects) but a clear tag would be rad as well.
Yeah I knew it was just pseudo-code but having never messed with STM code-wise it was a bit of a brain jog trying to figure out just what exactly needed to be changed. :S Probably shouldn't be up at 3 AM trying to do all that.
Thank you for all your help !
Edit: Doesn't look like an e2 event works for multi-layer parsing but you may be able to prove me otherwise.