I've tried a few approaches, and even just received in the mail 2 of these this1smyne knobs... but I still like using an expression pedal assigned to 12dB range on a FIL or PEQ last in the chain on every patch. My band just has too big of sound range at different times, and we are not mature enough to have songs dialed in with repeatable levels from each instrument in different sections of each song. I did a 3+ hour show last week, 30+ classic rock songs in a variety of styles, and I used 3 patches (dirty Tweed, Marshall, clean) with 3 scenes each for delays and modulations, and an organ patch. Sometimes I need to be way low in the mix to let vocals stand out, sometimes I use the same scene a little more blaring to be a prominent riff or a short lead section. So a fixed dB type solution would never work for me in this setup where every instrument regulates their own levels and we have no soundboard. Or I would have to create a separate patch for each song, multiple scenes for different song parts, but that sounds like a pain in the @ss for me as a hobbyist, and too inflexible with how much we change stuff.
