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I have owned a Roland FP4 for just over one year now. I have been thoroughly delighted with the instrument.
Previously, I owned a Roland FP2 and upgraded to gain access to some of the exciting features of the FP4.
Let's begin with the basics. It's highly transportable (fits in any car - even a Ford Ka if you know how!) and extremely simple to set up (I've had all number of children and adults have a go on it). The in-built speakers are an absolute blessing. The sound quality is very reasonable - certainly not enough to fill a hall, but they manage a fair sized living room easily. I played the piano recently at a wedding reception without any additional amplification and it sounded fine. The piano can, of course, be easily connected to any PA system you like - with it's stereo 1/4'' jacks on the back.
The instruments comes with, as you would expect, hundreds of "voices" to play around with. The standard "grand piano" tone is beautiful - not too cutting, not to soft. The bass notes sound particularly magnificent. The touch on any keyboard is very much down to a player's preference. In my opinion, the Roland FP4 has a fairly tight touch but the weighted keys have enough of a "thud" to them to keep the fingers well exercised.
My favourite feature of the Roland FP4 (which the FP2 does not sport) is an internal flash memory - that is, you can save all your settings, songs, backing beats etc. then turn the instrument off and still retain your setup. This has proved invaluable for performances. I can simply roll up, bring out the piano and choose from one of 24 saved "states" for the piano to be operated in.
The interface is sleak and simple. A great improvement on the FP2 is the ability to quickly cycle through settings and (as mentioned previously) save your settings for instant, one touch access. The settings can even be changed using a foot pedal - so you don't have to reach over with one of your hands to press the "next" button!
Another feature that particularly appeals to me to me is the extensive bank of onboard digital effects - including reverb, delay, distortion, flanger, filters, wah-wah and some really bizarre ones!
To summarise - the instrument is sturdy, easy to move about, looks good (in my eyes anyway!) and sounds brilliant. Of course I would strongly advise any potential buyer to have a go on one - nothing beats a 20 minutes "hands on" play around!