Players can create the tracks for lead, rhythm, and bass guitars and for drums, selecting from a number of different sounds and kits for each instrument. Distortion and other effects can be added to these tracks through Line 6 amplifiers in the "GHMix" mode. Players cannot record vocals directly, but can create a hum-along vocal line in the Studio. PlayStation 3 users with MIDI-compatible computers are also able to connect their computer to the console and use it for song composition; a similar feature is sought for Xbox 360 owners. Eurogamer reported that a crew at Activision was able to successfully create a "perfectly respectable cover" version of the first verse of "Smells Like Teen Spirit" by Nirvana.