1. With an LF+, you can remain in one Axe patch and use LF presets to turn effects on and off, and set X/Y states.
2. With scenes, however, you can also include a scene change command in your LF preset, and therefore, control the volume, specific by scene, to account for volume changes while engaging or disengaging any effects, or to intentionally change volumes to build or decrease tension in a performance. Best example of a very simple use of Scenes with an Liquid foot, would be to have no on/off or x/y changes between preset 1 and preset 2 in a song, BUT have preset 2 be louder, by including a scene 1 CC for preset 1, and a scene 2 CC message for preset 2, and then going into the output section of the AXE FX on scene 2, and turning it up louder than scene one. Of note, you can leave the front panel display on the AXE in the output screen, and press your Liquid Foot presets, to see the volume settings for each scenes (up to 8 in an Axe FX preset). That way you can toggle between them and set the master volume for each scene.
3. With regard to the post "can I have an overdrive and delay on in scene 2, and will the LF lights turn on and off to reflect the correct effect on/off's? The answer is "ONLY if you have the IA slots turned on or bypass, active in your LF pedal". In other words, if you go into your AXE FX and pull up scene 1, turn on an overdrive and a delay, then go to scene 2 and turn those off, and save that AXE preset, and then you hook up the LF pedal and recall scene 1 and then scene 2, and your LF pedal has a button for overdrive and delay on it, the lights are NOT going to light up to reflect the different effect states between scene 1 and scene 2. This is because the LF is only receiving TUNER information FROM the Axe. It is not a full service 2-way communication between the Axe and the LF controller. If you want your little stomp box lights to light up properly, you have to set your IA initial states on a Liquid Foot preset, and also select a scene. You can set up IA slots for scene selection, but make sure you don't have more than 1 selected in the ON or bypass within a LF preset. I program mine in the command lines of a preset, so the AXE preset is selected, then the scene is selected, and then finally, the IA slots turn on or off the correct effects or choose the correct x/y states. THe only reason I keep all of that busy programming that way, is JUST SO MY LITTLE STOMPBOX LIGHTS WORK ON MY LF during performances. Yes, I could jump between scenes on the Axe front panel, and turn my effects on, select x/y states, and then save the preset, and simply send patch change and scene change commands via my LF, but if I did that, my LF lights would not reflect effect on/off's anymore......and I would be sad...sniff sniff.
