The Flying Sloth

Yep, you're right there, TLDR is this, Bluetooth has massive latency for most audio codecs, while it's not often noticeable on its own, once you start mixing and matching speakers and controllers you're likely to end up with speakers slightly out of sync with one another which will really annoy you. Now, I suppose you could go down the route of trying to do lag compensation but that's a completely different rabbit hole to go down.

Change the Q2U to a different USB port, ideally a different circuit/controller

Arms are cheap, you don't need an interface with them, they come with the cables, They are within budget well and truly.

Fair enough, in that case building your own may be a decent option, other than my studio monitors all the speakers I use on the daily are custom.

For $100 the easy choice is the Tbone MB88U, Samson Q2U, AT2005 but take a look at the guide in my signature, I wrote it to answer this question

Reduce your sample rate and increase your buffer size, Make sure FL adn your PC are running the same sample rate tool. This is fairly normal behaviour when your CPU does not process the audio fast enough, generally a sign to get a better CPU or tone it down a bit with your audio settings .

Did you make sure you plugged in the front panel audio?

Simple problems have simple solutions, in your windows audio settings you can rebalance so that the right is louder

Take a look at the guide in my sig, I wrote it specifically to answer this question but it will also help you make an informed decision Short answer, Behringer umc202HD interface with Behringer C2 is a good budget option, it's what I got both my younger brothers. Longer answer, it really depends on the specifics of your situation, whether your space is treated and what you'll be using it for but as a general rule, mics from 3U, ADK, Advanced Audio, Aston and Groove Tubes can be found pretty cheap used and are usually stupid good value for money.

I'm with Psi, go for used studio monitors, usually you'll be able to find a decent set well under a hundred bucks and they will be miles better than anything branded by a consumer computing company.

Go for used studio monitors, you should be able to fairly easily find a set under a hundred and it's highly unlikely that any issues you experience will be the fault of the speakers.

This microphone is identical to the Neweer or otherwise BM800 microphone, these are electret medium diaphragm condenser mics that while technically not requiring phantom power certainly benefits from it, having said that, they sound absolutely terrible with the provided cable and I would hesitate to say they approach acceptability even using a proper audio interface.

No, please no, don't ever, just no,

Except that OP isn't looking for Analogue mixers, they're looking for an audio interface.. So when you say It's not relevant to this topic unless we begin to talk about mixers, Behringer has the Wing, the X32 and the M32 in ongoing production and they are excellent, there are no similarly priced mixers with flying faders that could be used in a studio, sure we could go back and look at the MIDAS Legend or Heritage line but those mixers only have recall, not motorised faders. Nobody here is defending the quality of the Behringer Xenyx mixers, they suck, as does every other small format mixer in a similar price range and I'm happy to concede that the Xenyx line isn't great, but we are talking about audio interfaces not mixers. The CT1 I mentioned is a solid-state inline mic preamplifier (and I happen to own one) that is built quite rugged if I'm honest and Is built of high enough quality parts that it is no immediately obvious how it could break without serious abuse, the soldering is decent, the case is ~quarter inch solid metal (likely aluminium), the connectors are relatively decent quality too. Sure their clones of high-end compressors aren't great but their EQs are pretty decent and beyond that my argument was only that they make some really nice products that still see use in studios, not that all their products do. Then it seems we are in agreement, you concede "Some products are really good, some are not" which is my entire point.

No, very much no, Mixers with USB connectivity usually are single channel recording unless we're talking significantly higher price and quality gear that a Behringer interface, beyond that, the mixer is unlikely to have ASIO drivers and further is likely to be made from the absolute cheapest components available in order to keep the price low while having many many faders / knobs / connectors etc etc. Sure Behringer interfaces aren't exactly the highest quality gear and if I was to compare them like for like against hardware from Motu, UA or RME there is no competition BUT the price is so significantly below those that I often recommend Behringer gear as it is the absolute peak value for money in non-critical environments. I've seen and used Behringer kit in commercial music studios, the ADA8200, BCF2000, Klark Teknik CT1 or Midas M32 (Upgraded Behringer X32) for instance and they do their job damn well, for sure Behringer gets a bad rap for stealing designs and sure often their products often may not be the pinnacle of quality but much of their kit is damn good for the price and some of it is just damn good full stop.