I find the internal drum sounds on the Korg M1 to be limiting. Is there a way to edit the sounds to give me a much greater range of selection -- e.g., better snares or hihats. Or, can I buy drum sounds to add, how do I add them, and where can I get them? I have a old Frontal Lobe that might help me load them. If all else fails, I'm considering buying an Alesis DR5 drum module. Do I need to go as far as that?