Voice to internal sound on S950

[hayseed]

I don't know if this is possible but I'd like to trigger a guitar sound with my voice    I'M pretty sure I made my keyboard play a piano triggered only by my voice   but can't  remember how I did it. I'd like to play lead  with my voice   Hands are busy with acoustic guitar rhythm.   Is this possible.  Also don't want any harmonies just to trigger any sound in the keyboard with your voice.   

Thanks Hayseed