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The Casio CTK-496 is perhaps the most basic of the CTK range from Casio. I have two other keyboards from this range that fail to disappoint, however this CTK-496 is awful, especially considering the price.
There are some good things about this product. It can be either powered by the mains (a plug is supplied too) or by 8 AA batteries. This is good as it means you can take the keyboard out and you won't have to find a plug socket. The volume of the keyboard is great too. With two built in speakers, the maximum volume is, if anything, far too loud. The keys in the keyboard, I feel, are weighted perfectly. They are easy to press and come back up at the right speed, not like some other CTK keyboards from Casio.
When looking at a picture of the keyboard, it may seem like there are a lot of buttons and therefore a lot of functions. This is not true. There is a small display in the middle of the keyboard which will tell you what mode you are in and there is a picture of a keyboard and when you press a key, it highlights on the display. As well as a lack of features, there is also a lack of different sounds. There is only a 2 digit number for the amount of sounds you can set the keyboard to, which is also the worst of the CTK range, with others offering over 500 sounds at not a much higher price. Now, the very worst part about this keyboard is the sound quality. If the keyboard didn't seem bad enough already, this ought to deter you from buying it. Now, on the very first sound the keyboard has is Grand Piano. The keyboard sounds nothing like a grand piano on any of these 99 sounds and for each, they all make the keyboard feel like more of a toy when being played as it does not deliver the quality that the majority of Casio products do. One final function is the 'chords' mode. This allows you to play single keys and the keyboard will play that chord, for example, if you press a C, the keyboard will play a C chord.
In conclusion, this keyboard is very disappointing. Averaging at around £100, the price is a little hefty too. The pros far outweigh the cons of this product and so it is not recommended. You can buy a much higher quality Casio keyboard, even in the CTK range, for just £20 or so more.