Very good point. I've mentioned this elsewhere but it's worth repeating to highlight this very issue. Around 3 or 4 years ago I bought a VT Bass pedal, I was seriously impressed by the sounds available from it going by the YouTube videos. Plugged it in at home and was really pleased with how it sounded when I'd dialled in the sound I'd got in my head. Took it to the next gig a few days later, set it up, checked the volume between on and off, and was ready to go. But when I kicked it in with the band, the bass vanished from the mix. I remember the guitarist looking over to see what was going on. I kicked the pedal off and the bass was back. I checked the pedal volume at the end of the song and it was fine. It was EQ'd to give a push in the mids while keeping the low end fat and enough highs to define the tone without making it top heavy. But it just didn't work, it sounded great on its own but it was an unusable tone suck in the mix, alongside a guitar and keys playing rock and pop stuff.