How do you get Korg Legacy bundle running as a plugin?

what version did you install? if it is an AU version, then it should just come up in your list of available instruments, just like all the rest of them. you may have accidentally just installed the VST version, which won't work in logic. you'd need VST wrapper from fxpansion for this to work, but if there's an AU available then you are pretty much always better off to go with that.

also, it's possible that your version needs an update, as some earlier versions of korg legacy did not pass AU validation, so logic will disable them from use after the first scan. check that you're up to date.

Have you purchased the not-free Universal Binary update for the Legacy Collection from Korg?

If not, that is why it doesn't show up.

You need to buy the UB update.

do you need the UB update even if you're on a PPC machine? the OP's system info says imac G5.. is this because the UB update version also includes logic AU compatibility fixes for PPC and intel?

Ah good point, my bad. I saw the "iMac" and assumed (wrongly) it was an Intel Mac.

In which case, run the installer again and make sure you have selected the AU versions to install. Run Logic's AU Manager and check the Legacy plugins are there and passing validation - if not, get the latest update that you can from Korg.

You don't need the UB update.