Depends on the price. Since I do not really want to get into making music as a new hobby, but rather am only looking for a tool to help me create some soundscapes for a KS level, and since I'm also not exactly wealthy, the money I'm willing to spend on this is limited. However, I'm willing to spend something - just not very much.
Overall, simplicity is the most important feature I'm looking for. Really, something comparable to the Knytt Stories level editor, only for music, would be ideal.