Hi and thanks for the feedback! You're right, at the moment there is no quick way to remove notes from a sequence for a specific track (I''m working on a few sequence specific tools for the next update!), however you can use the GENERATE tool and set the SEED value to "ALL OFF" which once applied to the sequence will remove all triggers.
Hello, I love the idea behind what you're doing.
To piggy back off this post, I wanted to second that I also have difficulty adjusting the sliders with just analog alone. Is there any way to map a button combination that allows the usage of d-pad for minute adjustments? If the vita keyboard could be brought up to type in the values directly, that would also be cool.