Im Using Acid Music Studio 8.0 With & Xenyx502 Mixer. Every Time I Record It Sounds Fine But When I Play It Back When Im Finished Its Off Beat How Do I Fix This??

Sounds like you need more ram or computer space. You didn't list what time of mixer or computer so can only answer basicly. If using a computer (which it sounds like) see how much the mixer needs andhow much space available on your hard drive. This is called a latency problem. Basicaly how long does it take for the computer to respond to commands while it is doing a task. either get a bigger hard drive and more ram or clear out some files on your computer. You can also go into settings and change the settings. You'll have to look through the manual on latency problems.

you have too much latency in your setup. Try using ASIO as your audio engine in your recording program. Also, shut down all unnecessary programs running on your computer to get better performance.

The reason it does not work is because the PV8USB only sends the main mix to the USB. You need a different sort of beast altogether to do what you are wanting.

Look at the setups for voice and audio in the Windows control panel, "Sounds and Devices". Make sure the devices are set to the sources and destinations you want... This is not automatic and is a pain when you are going back and forth from recording and playing...

If your mic can "hear" the beat, it will record it as well with a reverberation that will NOT be pleasing. Maybe you can use headphones to avoid that.

It sounds like the cables you are using, or the way you have it wired into the system are not correct. If you are using the stereo channels on the mixer, then the system also needs to be wired in stereo to the proper amp and speakers. Otherwise you hear the left or right side of the stereo mix, and not all of the music correctly.
Another problem may be the kind of cables you are using to wire the MP3 player to the mixer with. If you are using a 1/8" adapter to the MP3 player, make sure it is a STEREO 1/8" adapter, and that both left and right channels are plugged into the mixer, preferably on the first two inputs to test and see that both channels are indeed coming through. Then you may move them to a stereo channel. Again, make sure that the system is wire in stereo in order to hear both sides, Good Luck

It is likely you do not have the levels set correctly and are over driving the mixer. Reduce the trim settings using the PFL buttons and monitor the level indicators to insure you are not clipping.

With a condenser mic you CANNOT have any speaker in the room that the mic can hear of course. These mics are so sensitive. Your mixer and monitor speakers and recording will be in a separate room from the soundproof studio typically.

To monitor the system anywhere in the same room as the mic you MUST use headphones that do NOT leak sound or you will get feedback and distortion.

With a stereo splitter cable that takes the stereo 1/8 plug of the computer into two RCA plugs you could go into the "Tape Input" of the mixer... OR take a 1/8 stereo splitter cable from the PC splitting to a pair of 1/4 inch plugs go into one of the 4 stereo input pairs on the mixer... like 7 and 8 or 9 and 10 for example.

This is NOT likely to be a problem with the power source at all but more likely with some setup parameter. Search your manual for subjects like "quantize" and also sampling rates.

This is totally dependent on the software you are using to record.

Not knowing what you are using makes any response a wild guess.

IN GENERAL you must configure both the input and output device within the recording software you are using.

I use Sonar and one has to select the audio input and output device and tell the program which device is used for timing.