Product: scratchlive
Version: 2.2.2
Hardware: scratchlive-sl4
Computer: mac
OS Version: 10.6.7
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1.) connect SL4

2.) connect two pairs of Dicers
(lets refer to them as pair one: (1.1, 1.2) and pair two: (2.1 2.2) )

3.) this part is great: 1.1 and 1.2 control primary decks as configured in your setup,
2.1. and 2.2 control the other two decks. hot cues, loop rolls, autoloops, delete cues work great even with leds controlled correctly.

4.) now map some function on the shifted LoopRoll or Shifted AutoLoop page
for Dicer 1.x
and then some other function
for Dicer 2.x
on the same shift page and same button.
(same X i.e. two times master XOR two times slave dicer)

5.) still great - they both do different things, they do what you mapped them to.

6.) save midi mapping

7.) restart scratch live

8.) load midi mapping again

9.) BUG: now user mappable buttons of 1.x and 2.x do the same.
more precise, they do the last thing you have mapped.

workaround:
only use the native pages.