ok just one more pic then I'll leave you in peace.
This is Situater's control panel. All 35 notes within the PI gamut (and one extra) are available, giving each MIDI keyboard note one of 3 enharmonically related PI notes to play. What can be played at any one time, either live by the keyboard or from a MIDI region in the sequencer, can be set manually, remotely or automated and is always displayed by these keyboard note boxes together with the state of the 4 buttons associated with each note box.
To the right of each note box are two buttons: one to shift the displayed PI note up by a syntonic comma, the other to shift down by a syntonic comma.
Above each note box are 2 ET on/off buttons. The smaller one can set only its associated note to ET, for cases when the orchestral instruments and an ET instrument are playing together but at some point orchestral intonation would put the note too far beyond the ET instrument's fixed tuning. The larger ET button is a global ET on/off switch and display, useful for those moments during writing when it's easier to cruise through a passage in ET rather than be distracted or inhibited by difficult intonation issues that could be sorted out later.