This achievement is simple enough if you have to guitar controllers. I have added a song to GHTunes called “String Twins”. It is a simple song of one note on guitar and one bass with a 3 bar gap. The first note is a green on guitar, the second note follows 3 bars latter on the bass with an open. So all you have to do is hit those two notes on separate controllers and the achievement is yours. You will need to play on Expert Guitar and Bass but it is simple. After the song has finished you will have to wait a little bit for it to finish as GHTracks have to be a minimum of 20 seconds long to be uploaded. This track is designed to be playable by one person.