Exponential Wind-downs for synths?

[steve]

For anyone new to this thread, the topic is (I presume) “synthesizing siren sounds” (as per these topics: How to generate non-linear chirps? and https://forum.audacityteam.org/t/special-kind-of-frequency-sweep-chirp/21236/1 ). Is that right sirendude2011?

@sirendude2011

My question is, since I can generate exponential wind-ups now, is there a code someone has done and tested that can generate exponential wind-downs?

I expect that it can be done in a similar way to the wind-up, but I’ve not yet seen it in code.

I’d not be surprised if the wind down is non-linear, but is it “exponential”? Have you analysed the rate of pitch change?

Which code are you using for the Wind-up?