I had seen an electric guitar somewhere (can't remember) that resemble one used in guitar hero, but it's a real guitar for playing. It has buttons filling up the frets on each note to replace strings. You can strum without a pick and somehow the "button-guitar" sense the strumming.
I searched on google but couldn't find it (may be I didn't get the name right). What is it called? Electric-button-guitar? Who manufactures it?