Originally Posted by: M.E.Sthanks, what about for clarinet trombone and acoustic guitar and keyboard

Get a pickup for your acoustic guitar. As for the other a mic is the only way I would know of, and you will have to adapt it the same way as the guitar. If your keyboard is a newer model it should have a connection on it for hooking it in to the computer, I am not sure though do a search on the web about that.