I am experimenting with Sl-16 to control an old Kenwood VR-410 stereo.
I hope to be able to mute it or control volume and power via Arduino, etc.
I am basing this on a fork of code from @saproj KenwoodXS project (XS-8 protocol)
Also, found: https://sourceforge.net/p/amforth/mailman/message/34859069/