analysis wrote:load the korg sounds onto the indigo
No way, no-how.
Although you could certainly program similar sounds into the virus manually; I prefer this approach myself partly because (generally) I really enjoy programming my synths, partly because I'll sometimes veer off in a different direction and create an interesting sound that's totally unique, and partly because I will occasionally learn something in the process.
or somehow play the indigo using a korg sound via midi or something and be able to easily change between the korg and indigo
The easiest thing I think would be to connect the two with a pair of midi cables (or just one if you have no desire for the MK to 'talk' to the Virus). I'm not familiar with the midi spec of either synth, but it ought to be as simple as that to play one from the other, assuming they're set to send/receive data on the same channel.
or would i be best to just have the two of them on stage and alternate between them depending on the song?
That works too, and you'll look that much more badass
; of course you'd need both on stage anyway to connect them via midi.