[PD] Note name to frequency

[Sam Clayton]

Is there an external or abstraction that can take a symbol from a
message such as "Ab4" and output a frequency message, such as
"207.65234879"? It would be something like mtof, but for text rather
than midi note numbers.

Are there any externals dealing with turning text representations of
chords such as "Cma7" (or some other format) and sending the
appropriate frequencies to a collection of oscillators?

If not, could someone point me in the right direction to write an
abstraction or external to do this?

I'm fairly new to Pd and confused by the documentation.

Thanks,
Sam