Need help with getting audio from microkorg to mpc studio.

I just got a microkorg and I'm having abit of trouble hooking it up to my mpc, I've got the midi working and I can play and record sounds over my drums and hear them when I play it back but when I turn the korg off and play the beat it doesn't play the audio from the korg,

I've got the midi ins and outs going from the korg to mpc and I've got the audio out in the L/mono on the korg going into my audio interface and then I've got a 6mm/RCA going from the interface to my speakers, but yeah I'm stuck on getting the audio to record into the mpc software so I can playback without the korg, any help would be appreciated