You can purchase a keyboard for use with a computer from any good electronics retailer such as Best Buy in the United States or PC World in the United Kingdom. Alternatively both companies have official websites which sell things for home delivery, including keyboards.
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You need a yamaha audio gram .
The DGX-220 can play MIDI files, and there is a USB MIDI driver for these models, but there are no applications for XML files for these keyboards.
I don't know if you can, since I am a guitar player, but if you go onto youtube and do a search on "how to make your own talkbox", I know there was a guy on there that made a killer one for about $10, and he hooked it up to he keyboard and it sounded amazing. I would think if it has a ¼" jack, you should have no problems.
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Try this link. It offers downloads for drivers and manuals. You should be able to find what you need there. http://dxgusa.helpserve.com/index.php?_m=downloads&_a=view
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I like mine just fine. Got mine around 2003/2004 area. can record 5 songs x 5 tracks each and save it on the keyboard (and name the files as you do it). and transfer it as multiple file types onto a floppy disk (I use .mid most the time, know as "SMF" to the keyboard). But unlike newer keyboards its not 64-note polyphony capable so too many notes on too many tracks at once won't work ideally. But it has a great music (chord) dictionary. Plenty of great sounds. 100 demo songs. Plenty of harmony and effects. 2 fills, one intro, 1 outro for each style. built in speakers, port for headphones, sus pedal ect. You can even put batteries in if you want, but I never did. Lets you "dual" 2 voices at once, and volume adjust each one individually, or raise one of them up/down an octave ect. Lots of fun, and the manual explains everything perfectly.