I am not terribly sure that a comparison between the Krome and the PA700 would be terribly accurate.
In my opinion, they are two different machines. I have a PA700 and love it. I also have other Korg synths, including a Kross and an M50.
The programmability of the PA700, with regard to sounds, is fantastic. I have made many sounds with it and they serve me well. I am sure that the Krome would have somewhat deeper programmability, especially when considering the EFX processor. The PA700 allows for one or two insert effects as well as a master dual effects unit in program mode. In sequencer mode, it allows for two insert effects and two master effects. The Krome would have the edge here.
The PA700 is an arranger; it specializes in creating/playing rhythms with all of the options of intro/ending/variations/breaks. The Krome does not have this, but does have dual polyphonic arps that can sound 'arranger like' in body only.
I imagine that the sequencer is more powerful in the Krome because you can keep multiple sequences in memory (when it is in operation; they erase when the power is turned off). The same applies to the PA700 with the sequences in memory.
I like the sequencer in the PA700. The screen is bigger than the Krome and is easier to move around. The Krome does have the piano-roll view, where the PA700 does not. The Krome has the ability to layer tracks on the same MIDI channel though (I believe), and the PA700 does not.
The PA700 also has a built-in 50 watt sound system (25W/side). It sounds very good and can also be hooked up to an external sound system. The PA700 also allows for a MIC/Guitar/Line input with EFX (not on the Line input). It is very versatile.
If you are looking for a 'one man band' board, the PA700 is really the best for the price (I know, I looked at all brands before getting the PA700).
Both read MIDI files, but I like how the PA700 treats them.
If you want a synth, then the Krome may be the better option.
I love my PA700 and am going to get another one as a backup for my main one, since I use mine daily at work. I love it and it serves me very well.
I love my other Korg synths as well as my Ensoniq VFX-SD. They all have a certain function and as an all-around unit that does everything I need, the PA700 wins over all the other arrangers that I have used (and still have a Roland E-09 and Roland BK-5). I will be selling these because I do not use them.
I would have considered the PA1000, but the PA700 was a better price and had all the features I needed. It still does. In fact, I am still discovering new things about it all the time and I've owned mine since they first came out (my serial # is under 140). The PA700 has 256mb RAM for loading samples; I do not believe that the Krome has the ability to load samples.
Again, the touch screen on the PA700 is large (7 inches) and responds very quickly. It also has a KAOSS feature that allows for KAOSS type effects in real-time.
The Krome is a synthesizer/workstation and the PA700 is an arranger with lots of extra features.
I love the PA700
Grace,
Harry