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Sounds like the output cable from the 802 is not correctly pinned to your input on the computer. Fred is on the right track but you may need to take it a bit further.
It may also be helpful to use a Pro USB audio interface such as the Digigram UAX220v2 (line level version).
If you wish to use the computer's on board sound card consider an IHF/Pro interface that converts balanced audio to unbalanced , and the proper cables. Two 3-wire balanced 1/4-inch from the 802 to the left and right inputs of the interface (XLR Male), then RCA (Red and White) to a 1/8-inch TRS Plug cable onto the the computers audio input.
Henry Engineering's Matchbox HD comes to mind.
Never go from a PA (powered (amplified)) speaker signal to the inputs of a recording device. This can severely damage the electronics of the input/preamp. That error code may be getting caused by something else. For more details on how to use digital ins:
It is unlikely to find a compatible USB convertor for that digital recorder. If it has audio input you can probably use a similar cable to that for the IPOD described next. For the IPOD, get a 1/8 inch STEREO splitter cable that splits to 1/4 inch plugs or RCA plugs to connect to the PA system. Radio Shack will probably have a suitable one.
You have a ground loop. First, ALL interconnected equipment MUST be powered from the same receptacle or power conditioner. You need to put an isolator in that audio line. This consists of a audio transformer with isolation between primary and secondary windings. The function is like a DI box... but they usually don't make those for RCA jacks. One could cobble up using a DI and a pocketful of cable adapters, but it would be less expensive to get a small audio transformer from Radio Shack and make one with a female and a male RCA jack and plug. FIRST thing though is to get everything powered from the same source. Using multiple plugs at different points within a building is ASKING for these problems and also to damage your equipment. Yes, we have to run extension cords to bring power to the mixer from where the amps are at times... You MIGHT find for your problem you can use one of the impedance matching plugs that have a transformer in them. You would need a few adapters to get the connectors.
The ipod is stereo and the Marshall is mono. You would need to "mix" the left and right channels of the ipod. You could use a simple passive mixer made of two resistors, one from each of the two channels from the IPOD to a single plug for the Marshall. Just joining the two channels without the resistors would have the IPOD outputs fighting each other. You can use 1 K ohm resistors. All parts are available at Radio Shack.
Personally I would run the RCA outputs to the RCA in on the APS. If you insist on using XLR from the APS to the board (like through a snake etc) I would higly recommend using XLR to 1/4" adapters. These things have wonderful little transformers in them (yes, wire wound transformers) that do the 1/4" to XLR conversion really nicely so that you can run your signal through the snake or just so that you don't get the hum and distortion that can be associated with unbalanced signal transfer. You want a HI-Z unbalanced to LO-Z balanced adapter. Not always easy to find, but if you absolutely cannot locate any, I have a couple in stock. I suggest you look around though, because mine aren't cheap!
There are a number of configurations for a mixer like the 1832, the most common are PA system and Recording system.
There are Main output jacks which carry the mix as summed in the main faders. These in a PA system would feed the pa amplifiers which drive the house speaker system for the audience. These connectors are XLR 3 pin type on the rear, intended for professional pa amplifiers which use balanced +4dbv line input level. Amplifier which have 3 pin XLR connectors for input signals can accept that high level signal. For home style HiFi amplifiers, the signal level is nominally -10DBv and balanced or unbalanced signal lines with 1/4in diameter phone plugs which are connected to the mixer by way of a second set of Main output connectors which are 1/4in phone jacks. Use whichever amplifier input level your amp has.
If you are not using it as a main PA house mixer, but using it for recording, the main output connectors go to a 2 channel recorder or computer sound card recorder.
The power amp and your monitor speakers are connected to the connectors labeled "Control Room" (CTRL Rm). These output are useful for recording because the signal through the mixer can be monitored from several buses, Solo, main mix, selected by buttons provided. The buttons only affect the signal heard through the control room monitors, and not the main output which only sees the main mix so selecting "solo" does not interrupt the signal going to the recorder while the engineer in the control can be checking other signal paths through the board.
I have a 1222FX and here is how I have it hooked up. I have a cord that has an 1/8" stereo plug on one end and two mono RCA jacks on the other. The 1/8" end goes into my line in on my sound card. (not the microphone in ). The RCA jacks are hooked to two cords that I made up that have a RCA plug on one end and a XLR plug on the other. The XLR plugs are wired so that they are unbalanced. Pin one is ground and pins two and three are soldered to the positive. I used shielded cable and the shield is soldered to negative on the RCA jack but left unconnected on the XLR jack. This prevents hum. You may be able to purchase premade cables but I made my own. The XLR jacks are plugged into the left and right balanced or unbalanced Main output jacks of the mixer. On your computer click Start then Control Panel. Click Sounds and Audio Devices. Make sure that Place Volume in Taskbar is checked. Place the volume slider in about halfway position if there is one. Click Advanced and a control panel should pop up. It will say Play Control at the top. You will want your speaker volume about half way also. Make sure line in is NOT muted (checked ) and is also about half way up. Plug headphones into the mixer and get a good sound with the microphone you are using. If it is a microphone that requires phantom power make sure you turn the power to the mixing board on first, then the phantom power. Do this with the main volume control all the way off. When the mixer has warmed up for a minute or so you can bring the volume up to get a good sound. When you are done recording, make sure you slide the volume down again. Then turn the phantom power switch off and then the main power. This procedure protects your equipment. On the Play Control volume panel on your computer click on Options then Properties. You will see that it is checked for Playback. Check it for recording. Make sure that where it says Show the following volume controls, it has Playback volume and at least Line In checked. Now check the Recording Controls. Where it says Show the following volume controls make sure that at least Line In is checked. Click on O.K. and your Recording Control window will pop up. Make sure that Line In select has a check mark. Slide the volume up until you get a good sound through your computer speakers or your headphones if you have them plugged into the computer. If you accidentally close this window, Click on the speaker symbol in your taskbar at the bottom. You will have to switch between Play Control and Recording Control as before. You didn't mention what software you are using so I advise you to read your manuals carefully. The manual for the mixer has a page with wiring diagrams for cables. Here is a link to a site with lots of good info and an invaluable FREE book that you can download:http://www.recordingreview.com/ I hope this helps.
Read page 19 under Monitor section.You have to assign the signal to the monitor output you want. Page 36 has the details. All the info you need is here with some updates:http://www.korg.com/product.aspx?pd=191