stretched the htracks
moved the test buttons to the top-right
fixed the sounds on new instruments
moved the record button to bottom left of audio measure
restructured component to have an area for representations of the measures
back to where I started with new measureRep Model added
I think successfully renamed all files and references:
a SONG has a STAGE, made up of HTRACKs.
each HTRACK can have MEASUREs, which contain BEATs