On the PX-5s, can I assign the transpose function to a slider? I want to avoid the button presses normally used to transpose / change keys, to make it easier to transpose quickly on the fly (like the dedicated transpose button on the PX-560). For example, if the slider starts in the middle position, moving it up one notch would transpose + 1 half-step; or moving it down one notch would transpose -1 half-step. If the PX-5s transpose feature can be assigned to a slider, how would I do it? Thanks in advance.