Therefore, you just have to find the velocity setting controls for your brand of MIDI keyboard and controller. It sets the keyboard’s response to how hard you press the keys. The velocity parameter is what controls the MIDI keyboard’s output. So, how to fix a quiet MID keyboard? You fix a quiet MIDI keyboard by adjusting the velocity curve parameter of the keyboard in the MIDI settings. Fortunately, fixing a quiet MIDI keyboard is easy if you know the right parameters. It was a large, professional keyboard, but the volume was way too low when I brought it home to test it. I once bought an excellent MIDI keyboard from a yard sale.