Which, AFAIK, no-one here actually uses...

I rest my case!

Remember, fuddy-duddies CAN'T use the knobs... they are already playing with both hands Only someone that thinks that playing ONE part with one hand while he twists knobs with his other is all he needs to do has a use for this, surely?

I can't see how you could use this if you are actually playing an arranger (in arranger mode). OTOH, if you use SMF's or mp3's, it could be useful. But we ALL know that using SMF's or mp3's is not REALLY playing an arranger, don't we?
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An arranger is just a tool. What matters is what you build with it..!