Sinewave generator
 

back in the day i had some nice sine/cosine generators with graphical representation of the wave etc

allowed me to enter start/end values and output into dc.b/w/l etc

anything like that exist now?

There is Harmonics, you'll find it on Aminet

Back in the days i used to pass sleepless nights in front of this;
https://ibb.co/jyjnNG7
https://i.ibb.co/jyjnNG7/Anonymia-Di...xx-Amiga-2.png https://i.ibb.co/fkzsjSs/Anonymia-Di...miga-1-raw.png

If your sine tool is more recent or even win32 you could look after the Gang sinus creator

I used to build my sine tables in AmigaBasic!