[gentoo-user] Zynaddsubfx with keyboard input

Hi,

I am currently experimenting with ZynAddSubFX.
This synth has a virtual keyboard, which is accessible
via clicks of the mouse and via the keyboard of my computer.

When tuning parameters of the synth it is often of help to
hear, what the current parameter does with the sound.

All parameters of ZynAddSubFX are altered via the computer mouse.
Doing so will change the window focus of the virtual keyboard to the
parameter window and hitting the keyboad of the computer then will
have no effect (the keypress is directed to the window with the
parameter knobs, which has the focus now).

Zynaddsubfx will accept input from midi devices also.

I am no midi expert at all. :)

Is there any "Virtual keyboard" or anything else, which can be
used to interpret keyboard (computer) events to midi somthing 
and send them to ZynAddSubFX?

Thank you very much in advance for any help!
Best regards,
mcc