Shooting for BOTH markets without intimidating the current one ought to be doable, Ian. Like I said, HIDE the complicated stuff, but leave it in.

BASIC mode, and EXPERT...

Thing is, the parameter hooks are already in there.. How do you think they program the voices in the first place..? All that many more advanced users would like is some way to access them. Even if it's an external computer editor, it's better than nothing!

But hide it away from the noobs... wouldn't want to scare anyone!
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An arranger is just a tool. What matters is what you build with it..!