[ISSUE] Pad FX Roll multi triggers issue

Scenario:

- Load a track and select pad FX

- Assign Roll effect to button 1 with 1/4 tempo

- Assign Roll effect to button 2 with 1/2 tempo

- Press Button 2 and release it, OK the button is lighted and the roll is 1/2 tempo

- While keep pressing the button 2 then press button 1, OK the button 2 is longer lighted and the button 1 is lighted and the roll is 1/4 tempo.

- Release just button 1 and keep pressing button 2 => KO, the button 1 is no longer lighted and the button 2 is lighted but no roll with 1/2 tempo