What I actually see, as mentionned by other people, that if you play in the red it is easier to keep a constant volume. It won’t matter if you play one or two tracks at once, as you already hit 100% volume with one track. During the whole transition the volume will probably remain more or less constant. But due to this compressing (?) you will loose the dynamics.
i’d agree with this take.
it’s also worth mentioning that depending on the mixer, anything “in the red” stands a pretty good chance of outputting distorted. the effects of that distortion depend greatly on whatever’s next in the signal chain (maybe a compressor/limiter, maybe a crossover, maybe straight to the amplifiers).
i really try and stay out of the red and maybe pop into it now and again if peaking (and then back off a bit) - i assume the worst and that either the live sound or the recording is gonna be blown out.
Pioneer mixers going into the red will digitally clip, it’s just a matter of how high you go before it happens (remember the metering stops at a certain point but you could theoretically surpass that point by a fair amount). On A&H mixers which are analog it will induce distortion which is a bit different, but also not great.
The reason mixers like Condessas, Ureis and Bozaks have a “sweet spot” around 7 is because that’s where you get unity gain. They aren’t meant to have trim knobs, and so 7 is really where you should be stopping, whereas over that is “headroom” to compensate for lower mixed tracks - an album cut vs a 12 single, for instance.
I can pretty much guarantee any time a DJ is going into the red without it sounding like it there is a mild-to-wildly pissed off sound engineer working a board making sure it doesn’t sound like shit.
I think I read that they used the extra space, that omitting the crossfader gave them, to give the upfaders a longer range, which tbh is a lot more useful than a crossfader, for the type of mixing you probably do on a V10LF.
Something else you ought to ask yourself: how many of the DJ’s you see playing into the red do you think took time to do a soundcheck of the venue prior to playing? (Assuming it was possible, which is often the case…)