The MXR M-103 BLUE BOX shovels out enough low frequencies to frighten a blue whale.

The MXR M-103 BLUE BOX takes your guitar signal, fuzzes it up, then duplicates it two octaves down. You can control the output and also the mixbetween the dry signal and the effect. Using it 100% wet is quite an experience, but more recognizable sounds will appear as the dry signal increases. The MXR M-103 BLUE BOX is known for having a somewhat chaotic persona that can make each session of use a totally unique experience as this little monster can make it difficult to guess what is about to emerge from your amp. Trent Reznor uses these for his particular brand of industrial metal.