Actually,I don’t see the need for special tuner mode - easy enough to build a “Tuner” song with any specialized tuner plugin or the tuner mode of the various amp plugins. The advantage of this is that all the input routing, decisions on if or not to mute the output can be easily implemented within the normal song/rack scenario without the need for any new implementation.
The only thing we DO need for this is a way to automatically display a plugin’s GUI (even if the plugin is located within a rack or embedded rack!) on entering the “tuner” song (or state within a song) and to close it again after leaving the song/state (see related post “Primary View Rack”). Then everything could be simple without the need for a specific “tuner” mode.
Just my 0.02 EUR…
Cheers,
Torsten