first one is just blowing into the mic and the second is whistling

the red box spans from 1 to 5 kHz, where the target frequency will be

why it has a temperature

notes that temperature is also part of this thing

is it real temperature or is it analogous to a property of the waveform?

temperature data is from a thermistor sensor separately

just calibrated that data last night

all the code is is on github, too!