JonBoh
In that case, is there a way to connect the E-MU 0204 and Korg Microkey to the computer at the same time without the computer crashing?
The two (E-MU 0204 and Korg Microkey) should work exclusively to each other. The Korg should do nothing but send midi note (possibly some other things) commands to Sonar (or any program that accepts midi) and the EMU should do nothing but do digital audio conversion. Each has its own driver, and each work independently of the other.
Try reinstalling the Korg driver.
As far as Sonar goes, the tried and true method for midi to audio is easy:
Insert a soft synth, and have the soft synth dialog create a seperate midi track.
In the midi track, the midi output should already be set to the synth - and input should be set to omni. (Make sure the Korg is transmitting on MIDI channel 1) Also make sure the synth's track is putting out to a hot master or output.
That really should be all there is to it. The Korg will make midi notes on the midi track and the synth will take the output and turn it into audio through your sound card (Audio device)
Brian