Arturia,
Each of these sounds behave in exactly the same way. In a 64-step pattern, pages 1 and 3 eliminate most or at least half of the steps, then play all of the selected triggers for pages 2 and 4.
Pretty frustrated since I had to return my last Drumbrute due to multiple crackling volume pots. It was "fixed" but then returned with the same problem. So the seller swapped it out for a new machine. No crackles, but now this. Please help.