OK, here it is...
You can download the file at this link:
Here's how it works:
- Slider: select the MIDI note number that will activate the solo for the currently selected track. Can be set to any note number you wish, and can be changed at any time.
- On/off button: the function is self-explanatory (but it's a cable switcher disguised as an on/off button).
- Solo on/off commands (called "fader #3 events") will be recorded directly into MIDI regions, not automation. While it's entirely possible to record this data into track automation, it requires a more complicated approach to the programming as well as setup on your end.
- The single transformer called "Conv Note to Solo" is at the heart of the process: the slider sends a special command (a "meta event") to the transformer that actually re-programs the value shown in the Pitch field even if the transformer window's programming section isn't visible. The transformer then isolates that note and converts it to a fader #3 event (channel strip solo). The value of fader #3 events wants to be either zero (solo off) or one (solo on), so the transformer also takes care of converting all velocities of a value of 1 or greater to always be a value of 1. And note offs in Logic have a value of zero by default. Therefore...
Note on (any velocity) = fader #3, value 1, = solo on
Note off = fader #3, value 0, = solo off
Hope it works out for you.