Thank you, @krx and @nevenbucevic. This would be an improvement over the current “sacrifice” of one track to serve as audio palette, interim solution that @creativeunderdogs has publicized in their videos. 
One design question is how users can get there or even discover this function without reading the manual. There are several suggestions that imply adding more pages to the current views. I guess you can get a ring of pages by using the same key combination. In this case, users would press View to rotate from the default Mute-Solo-etc to the Keyboard to the Palette (to the Finger drumming?), etc.