The addition of the PFL option for the Solo buttons in TotalMix is wonderful for those of us doing very large track-count live recording. It would be even better if there was a mode where clicking on a PFL button de-selects any others already selected so one can easily work through PFL'ing many channels in a row. The option to shift-click if you want more than one on at a time would be good too so you do not have to keep changing between exclusive and cumulative modes. I am using an HDSPe MadiFX card on OSX if that's relevant.