Tanager Audioworks is the name of the firm that constructed the software which should be made in this quality a long time ago. Chirp converts your QWERTY keyboard into a powerful MIDI controller: it transmits Note Ons while pressing keys (velocity value can be set with the big slider above), ten drum trigger, and two continuous controller with the mouse. The Space bar is assigned to the Sustain Pedal. It is a pain that it's not a free software but it was the developers' decision: you have to pay 40 USD for it, here.