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On the rear of the piano there will be two 1/4" jacks labeled Output Left and Right. One will be labled Mono as well. If you are using a stereo amp, use both, and if a mono amp use just the mono output. If your amp is a guitar type, connect a shielded cable with 1/4" phone jacks such as you'd use with an electric guitar from these jacks to your amplifier. If you are useing a home stereo amp, you will need a cable with 1/4" phone jacks from the piano to RCA phono jacks on the amp end.
Generally mono outputs on this kind of mixer are usually balanced. This means all three poles of the connector are connected. The hot or plus signal (tip) will go to the left of your phones, the cold or minus (ring) will go to the right. This will be ok from a sound point of view But it may not have enough drive to make the phones loud enough. If you only hear a signal in the left then the output is unbalanced. A simple fix is a cheap headphone amp (less than 20 pounds) and a simple jack to two phono lead (wired as a split). There is a ton of old audio equipment about for very little money including some very small mixers, that have headphone outputs, that is what I have done a lot in the past.
The 1/8 jackon the PC is Stereo so you would need a stereo splitter to then go into separate jacks or maybe tape input on the PMP. Plugging in a mono jack shorts out one side of the PC audio out. Make sure you use a splitter type and NOT a 1/8 to 1/4 stereo cable. It must split into TWO cablles to plug into the PMP.
use the xlr (3 prong) main left and right outputs of the board. get xlr to 1/4 inch cables. one end will be 3 prong, to plug into the mixer, then the other end will be a mono 1/4 inch plug, like a big headphone plug. Then you have to get a dual mono 1/4 inch to stereo 1/8 inch adapter and plug it noto the line in. if there is no lone in, but a microphone jack instead, you will get a mono signal instead of a stereo signal. in this case, just use 1 channel of the mixer, instead of both of the stereo outs, and use a single mono 1/4 inch to mono 1/8 inch adapter.
the xlr to 1/4 inch cables can be purchased at a music store. the 1/4 inch to 1/8 inch adapters will probably need to be purchased at radio shack.
The MON faders ONLY control the output to the MON L and MON R jacks, NOT the split use of MAIN/MON outputs. You MIGHT try varying the MONO fader and see if it varies the MON part of the split output.
Best to use the unit as MAIN L and R to main speakers and use a stereo amp or POWERED monitors driven from the MON L and R jacks. With this, the MON faders will control your monitors as you would like them to.
ALSO make sure ALL equipment connected together is powered from teh same recepacle power system. Powering interconnected equipment from receptacles at opposite ends of the room is asking for damage due to ground bounce and faults.
PLEASE read my tip on here about a HAZARD of speaker polarity if you use Speakon to 1/4 inch cables.
It is NOT clear what configuration you have set up and what you consider the MONO output is, whether it is the power amp MONO side output or the line level MONO 1/4 inch jack on the top of the unit (this jack is NOT speaker output). If you can run normal stereo speakers using both sides of the power amp in the AB mode, the problems you are having is pilot error.
REMEMBER the main out 1/4 inch jacks are BALANCED TRS jacks... DO NOT put mono plugs into these.
A WARNING: If you use Speakon to 1/4 inch speaker cables, remember that the BARREL of side A is HOT, not the tip!!! You can fry the amp if you inadvertently ground that barrel someplace. (Side B has the barrel grounded) This information is NOT readily available in the manual and results in many a blown amp. They do this to implement the "Bridged" mode easily.
I have schematics and can unravel most any problem you are having.
Realize that when you plug into the one jack it disconnects the fingerboard pickup from the mix.
DO NOT USE "stereo" cables as it is intended to use TWO MONO cables, one for each side of the stereo.
IF you plug into the one jack that will connect to the bridge pickup, it will disconnect the fingerboard pickup from the mix BUT leave the fingerboard on its own jack.
That same jack will have BOTH fingerboard and bridge pickups IF the second jack (bridge) is not plugged into.
This is according to the schematic. If you find that yours works backwards, then either the schematic is wrong OR your guitar pickups may be electrically swapped.
I can understand your confusion... and a lot depends how you are going to use this. There are some caveats regarding the connections,
If you use the 1/4 outputs on the GSP, there is a speaker modeling like function that is NOT available, that IS available IF you use the XLR outputs.
The STP is an "Insert Snake" which is not really what you want as it is intended to send and receive (audio going both directions in the cable.
If you want that speaker function, then you should get two XLR to 1/4 TRS cables and go from the XLR's on the GSP to the Left and Right inputs on the back of the Crate. Your audio or guitar then is connected to the GSP guitar input.
If you connect the guitar to the crate and then use the STP, Plug the TRS single connector into the Left/Mono/send/rtn on the Crate. The Send cable of the Y should go to the Send jack on the back of the GSP and the return should go to the left return jack of the GSP. This connection I would NOT recommend as it will be noisier and you will lose the stereo effect capabiltiy since the effect is inserted as a mono.
I believe you would be happier with using the XLR's to carry left and right to the Crate and run your inout to the GSP. In short, you have the wrong cable to do the best job.