Haha.. We're confusing him, guys.
Ok, Shiseido...
The first picture I put up is called an audio cable. It has 1/8th inch connectors on both ends. 1/8th inch refers to the diameter of the plug itself. You have two common sizes (not counting RCA) for line-level jacks: 1/8th inch and 1/4inch. 1/8th inch jacks are common for headphone jacks on consumer level equipment. What this means is, the small hole on your MP3 player is the same type of hole you probably have on your keyboard. If you take the plug on your headphones and plug it into the keyboard headphone jack, you have just confirmed this is 1/8 of an inch.
That tells you that you need an audio cable where one end is 1/8th of an inch.
You should also know that it will need to be a stereo cable, not a mono cable.
Thus, we arrive at: 1/8" stereo audio cable.
The only thing you need to determine is how long that cable should be.
Now, for the other end. You could do one of two things: Buy a cable which has a 1/8" plug on one side and a 1/4" plug on the other.. or a straight 1/8" to 1/8" male/male cable and use a 1/8" to 1/4" adapter.
You still with me?
The reason it needs to eventually end up at 1/4" is because common line-level inputs on any piece of audio equipment excluding crappy computer sound cards is going to be 1/4" in diameter. (The line-level input we're talking about here is your PA mixer's line-input for whatever channel you're plugging into)
So if you look at these facts, you should be able to deduce that you need a cable that, in whichever way you choose, has a 1/8" male connector on one side and a 1/4" male connector on the other.
The 1/8" side (the skinny one) is going to plug into the headphone jack in your keyboard. (If the skinny one is too small to fit correctly, you know you need a 1/4" to 1/4" cable)
The other end of the cable, the 1/4" side, is going to plug into the hole that says "line-in" on any particular channel on the PA mixer.
Once you've accomplished that, you're technically done. I'm guessing you don't have any experience gain-staging or EQing, so we'll just stop here.
OK. Now, SATCHMO:
I just turned my head and stared at my Mackie 1604 VLZ pro and smiled at the fact I know there's 1/4" line input jacks behind it. I also smiled at the fact that I have used and researched A LOT of standard mixers and I have NEVER seen a board that features ONLY XLR inputs for the channels. Maybe I haven't looked back far enough, I don't know. But I do know that 1/4" TRS jacks are a standard input on any decent mixing board and have been for ages.
I'm actually interested in what type of mixing boards you have experience with.
Also, yea I may have assumed that the OP is using a built-in mixer in his PA setup, but that's usually the standard now days for affordable all-in-one units, so I went with it. If I'm wrong, he should clarify.
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