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Yes I have used the speed change mainly because I'm just not that fast yet with some of the more difficult chords. What I find great about that you not only have a hundred different drum patterns to play, but actually many hundreds or even thousands once you change the pitch.
For me the value has been in practicing with essentially a back up band that can play down my level (speed). It's great being able to lay multiple overdub tracks over my play and allows me by trial and error what works and what doesn't in real time versus just reading what the rule book says.
Feel like a kid with this thing."
They cost about $400.00
I have not heard a Blackstar live, it may sound better than a line 6 jam, but I really doubt it can do as much to help you learn.
