Noticed a technique issue when playing MPE apps. Found that when sliding the finger up the key sometimes I inadvertently slid too far and hit one of the 4 sliders by mistake. This caused settings to be changed. Fix is to train yourself not to slide too far or install some way of stoping your finger from accidentally hitting the slider. Love having the sliders above the keys but they are very close to the end of the keys, most likely by design. Update 5/26/20: Other than the first time I used the KBP4 I have not accidentally hit the sliders.