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A lovely little beast is the Korg ES-1 (A birthday gift from my wife), combined with a smart media card reader it is very versatile, though I do wish there were some easy way on the pc side to view/edit patterns/songs, just a little midi based sequencer etc. Did not like the fact that I could not easily take it on trips with me (no battery option), so I just finished making a battery pack for it.
Battery pack for Korg ES-1: Radio Shack item # 274-1573A (pkg of 2) This is a Coaxial DC Power Plug 5.5mm outer diameter, 2.5mm inner diameter, cost $1.69 Radio Shack item # 270-386A This is a 2 "D" Cell battery holder, $1.59 Radio Shack item # 270-396A This is a 4 "D" cell battery holder, $1.79 Some Solder, a soldering iron, and more wire if you want more length between your Korg and the battery.
Take the red wire from one of the battery holders and solder it to the black line from the other holder. The 6 "D" cells now connected in a serial fashion will provide the required 9v for the Korg. The power connector unscrews to remove the metal connector from the plastic wire shield. Pull the wire to be connected through the plastic shield (making sure it is oriented properly to screw back to the rest of the connector when you are done.) Run the red wire (or the longer wire you have soldered to it) and solder it to the DC power connector so that it is connected to the External side of the power connector, and the black wire so that it is connected to the inner conductive cylinder. Screw the plastic shield back onto the DC power connector. If you need to use electrical tape to tidy up a bit do so. Put 6 "D" cells following the directions imprinted into the battery holders (should be in alternating directions with the + of the last battery attached to the red wire).
Now plug in your Korg, turn it on and have a blast...... (please be carefull, don't goof your wiring.....I can not be responsible for the safety of your device...........) I have had mine running on battery power now for the last two days, and so far no problems, but I have not tried everything out.....Please back up your Korg while on the power supply first...dont want to loose anything if your battery dies during an operation! You Could of course use "C" or "AA" batteries with appropriate holders, I went with "D"'s simply because of their charge capacity. I am guessing that I will get between 10 and 20 hours run time per set of batteries. So far 5 hours running and no sign of problems...I would not use a 9v battery despite the relative ease of connecting it up because of the low capacity.
As for the Korg ES-1 itself, it is a blast to play with. The time-based method of assigning sample playback times is easy to grasp and use. I do wish that there was more memory and that we had more "Parts" or samples available to use with each pattern (enough to provide several instruments with several octaves worth of samples would have been ideal (a small dial to select a bank next to the sample ("Part") buttons would have been sufficient. I also wish that Songs, Patterns and samples would save to Smart media cards individually and in formats that could be worked with. As it is now, you can not work with a sample taken by the ES-1, as it saves a single file backing the entire device to a proprietary file. Saving WAV's and Midi's (for the patterns and songs) would be infinitely more useful. At least you can work with WAVs and AIFFs externally then load them off smart media cards (using the filename trick "00 thru 99.wav") but patterns and songs only exist ON the Korg, there is no import ability, and your work can not be transfered elsewhere when you have it the way you want it. Finally, It would be nice to have each effect indepedent of each other, and a true pitch conserving time-stretch would be a real plus.
Now, I have come up with quite a list of "flaws" or improvements. But given the sheer flexibility, power, ease of use, and just plain fun to use of the Korg ES-1, and given the portability with its new "battery" I give it a 5 out of 5 (4.5 would be correct, but since I have to pick a 4 or 5, this will have to do). For the price it is quite a bargain........
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