OK, but I don't want to freeze all tracks. I only want to freeze the parts of all tracks contained within specified bars or sections which I select.
If you think about a spread sheet, I don't want to just freeze a row, which is what is similar to current track freeze. I want to freeze all rows in sections of columns. Columns being similar to the bars in the Chord Sheet.
I would need the master bus for the unfrozen sections I still want to work on.