Newbie here. I already own a Yamaha keyboard, which is pretty much like a piano but with all the options for DJ and change of tone etc. I want to be able to modulate pitch and such with modulation wheels and knobs and sliders. All of which I know are available on midi controllers but I want one without the keyboard; Since I already have one (a keyboard). So basically, is there any way to synth my existing keyboard... like a keyboard-less MIDI controller... that I can connect to my Yamaha?