Sun Jan 20 12:10:31 CET 2013


Yeah I want to implement onepole in terms of twopole.  There are no
"larger" delays, except for real delay lines which need a separate
abstraction anyway.

Let's just go for twopole, or better a SVF: all input/output
processing (non-feedback) can be removed later.

So... I'm still using add/mul in the implementation..  No no no this
needs a different apprach.

I need a `rec' operator.  Something like the ai-lambda form that
performs state feedback.

Basically, this is a type issue:
- scalar functions
- output feedback

However, it feels as if this mixes two abstractions.  Output feedback
stream processors are an implementation detail.

It's a tough one...