sound system

[Lukas]

hi I have request can someone do for me a sound system I think I should explain it better so here we go: when you press "a","s",or "d" button you have sound for example guitar but sound continue till I'm pressing button and stop when I stop presing or sound will end. And when I press for example "enter" instead of guitar sound I have drumss sound by pressing "a", "s" or "d" can someone do something like this?
Very important is that when I'm stop pressing button for example "a" sound disapear.