Circuit Tracks Sound engine

I bought a circuit tracks, But I'm on the verge of returning it. It's a really fun toy. I've got some complaints but one of my main is I just don't think it sounds that good.

I own a korg m1 and part of what drew me to this was being able to expand the aged sounds of the M1. Overall I think the M1 sounds much richer and more dynamic than any of the sound I can produce with the CT.

The caveat here is I'm using the built in presets. Can anyone recommend a sound pack that they think is just the best sounding thing ever?