RobLanePT all you do is choose the volume control to be a song volume which should be blue in colour by touching just underneath the fader if it’s yellow it means you are controlling master playlist volume , you can easily swap this setting by single touch on playlist volume heading or song volume heading under the fader. A quick double click on the fader zeroes the volume setting.
Each playlist can have its own volume settings just like each song so it is absolutely flexible.
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The trick is always mix your new songs to a default song so your levels are consistent , then you minimise on stage tweaking to a minimum.