All applications are MacOS only
OffAir was created many years ago. Most likely it will work. If it doesn’t, send me a note.
Instructions: the left dial controls the level, the right dial changes the tuning. The [auto] button will set the tuning to automatic.
This application is built with Max from Cycling74. Should you have an iPad with Mira installed on it, then you can use that as a control device for Havoxicon.
Havoxicon is free, and in it, the source code (at least, part of it) is included. You find it when you choose About Havoxicon from the menu.