Span_dynamic_performer

[Stephen]

crescendos and decrescendos bring the dynamic level to near or below audible 
in my midi files. This is a known bug in midi?

My solution for now is using the following line for the midi block:

\midi { \context { \Voice \remove Span_dynamic_performer } }

I am focusing on midi because Mutopia expects a the lilypond files submitted 
there to produce midi files. Given the state of midi in lilypond, it may be 
premature to make that a requirement, but it is.

Stephen