ochre

Copperbox revision 2905.

I've changed the syntax of the embedded DSL to be statement oriented rather than expression oriented.

With expressions, I found that I couldn't get tuples "for free" - I would have had to embed them in the DSL even though they can't feature in the final code (Csound has no tuples). With a statement based language I can get more from Haskell's do-notation.

The compiler remains the same - instruments are still first-order expressions, but there is an additional translation step from the embedded language to the compiler's internal syntax. Currently the translation has errors and the 2 more complicated instruments in the demo don't compile.