NEURONAL and axion transmission is roughly 270 kph but can be up to 470 kph.It depends on age, myelination and axion thickness.
Eyes are fast at about 15 microseconds travel time.

https://newt.phys.unsw.edu.au/music/note/ THIS CONVERTER can help chose notes that can pin point notes like 150 hz (D3) that makes human brains produce the most dopamine. A cello can produce a great D3.