Prayash
As I stated in your post in the "Roland Keyboards" section of this forum, I do not normally get involved in recommending keyboards, but here, as with there, I will, because the three models you have mentioned are three entirely different types of technology, and a mistake at this point could be thoroughly disappointing and a sizeable economic error. As SeaGtGruff has stated, the Roland A-800 is strictly a MIDI controller. It has no internal sounds of its own. You would need to connect it to a computer or to a "sound module", such as a Roland "JV" or "Integra-7" or Ketron SD2 sound module. Any of these choices can be quite "pricey", but without at least one of them, the A-800 will make no sound. The XPS-10 is the typical "professional" keyboard with an ample palette of modern and vintage synth sounds, as well as those of traditional instruments. Some would refer to it as a "synth", but synth "purists" would argue with that, since it does not produce its "synth" sounds in real time from oscillators (as a "true" synth does), but rather "plays them back" from pre-recorded wave samples stored in Read Only Memory (ROM). For that reason, they are normally referred to as "ROMpler" (ROM Player) Workstations, but never-the-less, they fill a very important niche in the keyboard world. Now we come to the model I am most concerned with - the Roland E-09, which is an "ARRANGER" Workstation. It includes an auto-accompaniment engine that provides fully orchestrated accompaniment rhythms. Most "professional" keyboard players and band members view arranger workstations with considerable disdain. They see them as "home hobbyist', "amateurish ", "non-professional", "cheesy", "toys". As a longtime arranger keyboard player, I wholeheartedly disagree with this, but if you are thinking of a unit that will fit in with a band, something like the XPS-10 would probably be a better choice. While the E-09 would allow some editing of its sounds, it would not have the professional sound editing capabilities of the XPS-10, which is almost a necessity for a band. However, if you have need of fully orchestrated auto-accompaniment and plan on "one-man-band" operation, for gigging or just personal enjoyment, then something like the E-09 would be a better choice. Like most recent Roland ROMplers, the XPS-10 would allow you to arrange some basic drum, bass, and arpeggiator backing tracks, these would not be the same as the fully orchestrated real-time auto-accompaniment of the E-09. I hope this helps you with your choice for these units, or any others you might consider. Good luck with your choice.
