: What do I need in a home recording setup to eliminate a problem with recording and playback happening at different speeds? I'm looking to record myself playing one part at a time, but I always run into the problem that my

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What you describe sounds like an error in the product. Take it back to where you bought it and demand the problem to be fixed, or get your money back.

It might be better to buy another audio interface. I recommend the Steinberg UR series of USB audio interfaces. Very high quality build, good sound, good solid drivers, low latency and costs almost nothing. Works on Mac, Windows and iOS/class-compliant. The UR22 has MIDI I/O, separate volume controls for headphones and stereo line outputs, two mic preamps and channel 2 has an optional Hi-Z input mode for recording guitar/bass directly into the box.

To clarify: a computer audio recording system is very complex, and most of the relevant components are not mentioned here. The problem might be in many different places, and troubleshooting it through a site like this is impossible. That's why I recommend narrowing down the search and replacing the audio interface and its drivers with known good parts that "just work". I'm not saying that the Behringer Xenyx thing couldn't be made to work with any effort, but I'm suggesting it might not be worth it. I have a Xenyx 302USB, and I've used it as a simple line mixer and adjusting levels and EQ when digitizing old analog video recordings. It did seem to work for USB audio I/O at least so I could record something with it, but it's in every way a cheap device. It's a bit noisy, and IIRC there's no way to monitor only the computer's USB signal when playing live, which is a must to use computer based guitar amp simulators - and you can't get the USB audio to work with very low latencies either. Very cheap little thing, and if you are able to do something with it, it's a nice bonus.

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This sounds very odd! Normally, playing back one audio track while recording another shouldn't result in any obvious timing issues; there obviously are delays (latency) in getting the audio into and out of the system, but an interesting characteristic of ASIO drivers is that they are aware of these delays, which allows your recording software to compensate for them so that each newly-recorded track lines up properly with the tracks previously laid down. This has usually worked properly for me even on the much lower-powered systems of 15 years ago; the only time it didn't work was on a version of Adobe Audition that genuinely hadn't been coded to work properly for this scenario, and even then, it didn't give me issues with audio getting progressively further out of sync.

The only explanation I can think of is that your played-back audio is suffering from buffer underruns, which is causing very small pauses in the played-back audio, which over time might cause things to go out of sync. I don't even think that explanation is likely though, as AFAIR ASIO drivers deal with recording and playback in the same callback, which should mean that they are always dealing with sets of samples that correspond properly.

So apologies for a non-answer, but I agree with piiperi that you might just need to try to do some component swapping to narrow down the problem. A different interface would be a good place to start (I'm currently happily using Behringer's own UMC204HD), but perhaps try a different computer, with a trial version of a different DAW too, to try to get away fully from the ghosts in the machine...