I have been setting up riffs like drums and bass to play as accompaniment in the left zones, and then played the lead parts in the right zone.
However, I could not come with a solution to setup chords so I could trigger minor or major chords with the left hand and change between chord types as needed from the setup. In other words I want it to play a chord pattern (from a riff) and be able to control minor, major, etc.
Any solutions to this?
No easy solution.
1 way is to change the underlying program so that you have controllers to control pitch on certain keys, by using the Opaque parameter and extra layers.
Another option is to have multiple zones that you switch between with different riffs on different zones, but using the same sound (and even the same MIDI channel)
Another way is to have custom keymaps that vary per layer in a program and use controllers to switch between them.
Another way is the method used by Daniel Fisher when he created the K2600 Shine On Patch where he has a bunch of different keymaps on a large number of layers where he pushes a single key and it triggers chords across multiple layers. Each keymap is customized with a very limited key range. It's effective, but very tedious and time consuming to program.
There are probably other ways as well, but this might get you started.
The Puppeteer
Thanks for your feedback The Puppeteer.
I was considering one of the suggested solutions (different riffs on different zones and keys) but was hoping there could be less tedious solutions. Like wouldn't it be great if there was a parameter in the setup that would enable you to play multiple notes, in the same zone, using a certain pattern?
Nevertheless, it's very helpful.
You could use Arpeggio's in chord mode (I'm pretty sure it's available on the PC3 - certainly is on the K2600).
Hold the chord, and the arpeggio will play the pattern.
The Puppeteer
Yes it is possible.
What you want to accomplish is something a automatc accompangnement of a keyboard (not synthesizer/workstation) would do, like the big organs like Wersi or Yyamaha or the smaller ones from Yamaha/Korg/Roland and in the past European organs would do. The machines the "real musicians" avoid like they have somthing stinky on them 
So in fact, the system of the PC3 is not really supposed to do that kind of stuff. You can program any kind of sequences you want to have played, you can also set them to response to play in different keys while you hit the adjacted key, but it won´t change the chordpatterns like they would in one of those keyboards. You can trick it to come close, but not really. If yout want it, the PC3 wants you to play it by yourself 
Hi,
And, of course, you can get creative with keynum and keyvel... although layering multiple zones to do the chords might be tricky, but possible.
https://www.youtube.com/watch?v=u_-gmI1gvNQ
Regards,
Fran
Alternatively buy one of a Yamaha QY series. Plug it in both MIDI IN and OUT. Then in setup mode make it so that:
-
The left part of your keyboard produces only MIDI OUT data on some channel but doesn't trigger PC3 sound engine.
QY is in the fingered mode. QY MIDI IN receives note data from the channel of the left part of the PC3 keyboard.
A PC3 layer receives data from an external MIDI channel. The number of the channel should match the number the channel of a QY accompaniment track.
[/list:u:30cuzguy]
In the end PC3 would trigger an accompaniment pattern in the QY which in its turn would transmit note data back to the PC3 and trigger its sound engine.
You would have a triple headache (PC3 + QY + integration between them) but it would almost make your PC3 into an arranger keyboard. Is it worth the hassle? Probably not. A dedicated arranger would be a lot more convenient.
WARNING: STRONG PERSONAL OPINION (RANT) AHEAD
PC3 arpeggiator is unnecessary complicated. There is no use for many (most?) of its features.
It, though, can be a good thing for experimentation. For example try to plug a drumkit in the arpeggiator. By varying the trigger note, velocity and shift pattern you'll get multitude of rhythms that you can then record and use as riffs. However Kurzweil totally neglected the opportunity to implement a diatonic arpeggiator. How difficult is it to implement a transposition of a shift pattern from one key to another? Not at all difficult compared to the rest of the arpeggiator. Even CASIOs do it for decades. This is a software feature that could be implemented in an OS patch. Instead we have all those latch modes and so on with little to no practical use.
I understand that this is mostly a political issue. Market is divided in segments and this feature is more appropriate for "arranger segment". So in the future we'll either see a Kurzweil arranger or no implementation of the feature at all.
