I solo into the phones all the time. Part of my issue is that I do a lot of events with kids. Sometimes they move their lips but don't sing. Yet there is enough stage volume for it to seem like there is some singing going on from the meters. Also, I use a lot of lavs and their wires are delicate and prone to crackle. I need to single out the offending mic and shut it off. Granted, I am working with 24+ lavs at times and I wouldn't be with a small remote mixer. I usually mix with an O1V96VCM.
As for a BT phone link, the latency would make this untenable. Even with BT APTx low latency (~40ms) the phones would sound like a slapback, not the main signal. Singers usually start to have problems if their monitors are more than 10ms delayed.
This doesn't make a lot of sense. You can solo the kids channel to hear if the kid is singing, but if he's not - there's nothing you can do with a mixer to change that. Finding a bad mic among 24 well, you need to get better mics. If there are 24 kids why aren't you using overhead chorus mics and head setting only the soloists? At the very least, with 24 open mics you should have them in an auto-mixer rather than trying to man handle them all.
How are you getting 24 mics into a mixer with a stock configuration of 12 mic pre's? What's your expansion card and I/O at the stage end?
You last comment makes no sense at all, because the solo is for headphones. Delay is not an issue when you're tweaking channel strips. You wouldn't use the headphone output for monitors at a FOH position - you'd home run an aux send, and delay it to match the program arrival. Not sure why you're describing a singer's monitor as connected to your headphone jack???
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