Well, you only need the PA system if you are performing live. You will need a nice recording mic lke the AKG C 414 XLS for recording an acoustic without plug-ins. If all you want to do is record, all you need is a desktop recording software like the Lexicon I-Onix U-42, the VL3D a Mic and guitar. You can integrate the Electric piano, guitar, vocals, and eveything else onto multiple tracks, mix and produce your music that way.