WAF file grasshopper

Its not very clear what exactly you want. In general there are ways to input the sounds as wave length into Grasshopper.

I have experience using G-Howl back in 2011, but it hasn’t been updated in a long time seems some other people use firefly

Have a look in the forum:

You basically need some plug in that will connect grasshopper with an external software that can break the sound into its frequencies