There's a lot more hidden than transport controls. The "Mixer", "Read", "Write" buttons are used to switch between channel, bus and output views. This also changes the view on the Sound Devices display. For example, if you click the "Write" knob, the bus view is shown and you can then edit a specific bus by clicking "Sel" next to a fader button. This is how you get through the Sound Devices menus very quickly. The "Return" key calls up the normal menu on the Sound Devices. There you can use the jog wheel to go up and down and select things (has a click). It behaves like the headphone knob from the Sound Devices. Also for the headphone volume in all other menus and the normal recording screen. I used the jog wheel for volume very much and also the "Mixer", "Read", "Write" buttons. "Stop" takes you from anywhere back to the recording screen and it also shows the name of the next take. You really don't have to use the sound devices knobs so much anymore. I can't remember which button was to switch to enhanced channels 9-16. But one of the "Trans" or "Chan" and "Bank Flip" was it. Also very useful. And then of course there is the master fader. That was the main reason for me to go for the "m+". The display also makes a big difference. This allows you to use all gain buttons above the faders for specific settings in the channel view. If you select a channel you will see all the selected options for this channel in the display and you can edit the most important things with the gain knobs 1-5 (you see "Chan Source, Delay mS, Limiter, HPF Frequ"). And with the gain knobs 6-8 you can edit/ activate the EQ values for this channel. You have to learn that, but it's definitely better than on the mixer itself. Another thing to learn - the Icons fader behavior: the LED light under the channel number needs to be lid if you move the fader around. Without it lighting up, the fader goes back to the position where you started. You have to have your fingers on the faders from above so that the LED comes on. Pushing a fader from below with just the finger tip does not work. The fader doesn't notice that something is happening to him and will refuse to stay where you want it. Is irritating/ annoying. But after adjusting the sensitivity and fader speed I find it ok.