Reasons to work on a computer instead of a Kronos;
1. Better editing (not just microscopic, ANY kind of copy/paste/cut/move/delete is easier)
2. Way more screen real estate leading to a better overview of your song and possibilities
3. More flexibility in fx (routing, application and number)
4. Better specialty processing (e.g. Pitch correction, noise reduction, really you should see the new Melodyne ARA integration with Sonar and Studio One)
5. Virtually unlimited hardware configuration (I/O, RAM, storage, midi devices)
6. Easier to fit any budget. While the Kronos hits a good price point when you combine all features, you can get a good DAW from 1500 bucks up to any amount, depending on the features you need and the money available.
7. Compatibility with major name VST/AU manufacturers for the best and most up to date fx, synths and sample libraries
8. Better metering (!) (!!!)
9. Unlimited number of audio and midi channels, not just for playback but also for multiple takes, logical splitting, parallel processing etc.
10. Record at any sample rate and bit depth and write to any common audio format.
11. Score to video (!)
I still love my Kronos, and I do appreciate that you don't have to spend time fiddling with drivers or settings so much. But for me, any time spent doing that is earned back ten or even a hundred times by how much quicker and more efficient I am when I'm actually recording/editing/mixing. I couldn't even do many of the things on the Kronos that I do routinely on my DAW (e.g. Melodyne vocals, quantize audio, side chaining one band of a multiband compressor, using more than two busses, tracking multiple takes on a single track for easy comping, etc.). There is just no contest at all.
I don't mean to put you off the Kronos, I think it is a GREAT board and it would be a great "starting point" as a sound machine and midi controller for a studio if you don't have those yet. But if you're at all serious about recording, I'm just afraid you'd be very disappointed very quickly. And with all due respect, ProTools 7 doesn't represent a modern DAW workflow anymore. Midi editing was never great in ProTools, and version 7 lacks many of the advancements in audio that have happened in the last few years. So don't use that as a point of comparison.
Definitely, definitely do NOT count on a sequencer upgrade for the Kronos. While many people have asked for it and Korg has been generous with its updates so far, there has been no indication that it is even being considered, so you should not base your buying decision on that expectation.
Finally, yes you COULD export your vocal track as a WAV, edit it and later paste it back in. But, as a point of comparison, when I need to fix a note in a vocal comparison, I select the area with the mouse, press CTRL-M which makes Melodyne pop open with that area already analyzed, I shift the note to wherever I want it and I'm done. This takes me literally less than ten seconds.
In your case you'd be lucky if you'd manage it in under ten minutes. For me, that would really take any fun out of making music, not to mention my clients would be very upset
