Playing your guitar in stereo gives your music a much larger and ‘wider’ sound. It makes your guitar sound feel like it is taking up the whole room. Pretty much all recorded guitar sounds are produced in stereo to give the music a fuller “presence” in the room and a wider resonance. When you listen to headphones, you can head this. . To have your guitar in stereo, here are a few tipsFirst,buy a stereo amplifier such as a fender Princeton chorus or any other digital modeling amp in which line 6 is stereo. Secondly, buy a modern digital guitar processor. Use any modern digital guitar processor. These units usually have two outputs (left/right). Run the two leads to the two channels of a mixing desk or mixer/amp unit as long as the PA system is running in stereo. This is very vital. When you are finished, hard pan each channel to each of the left and right outputs. Some mixing boards include the right and left channels and you can attach both outputs of your processor to one channel. If you wish to hear your guitar separately from the other instruments, you will still need to “monitor” your sound through some type of amp that is not part of the PA system. Most bands these days elect to run everything into the PA system and have no stage amps at all. Additionally, you may use two amplifiers and use one of the effect processors mentioned above or any effect unit such as chorus or delay unit that has two outputs. One output goes to one amp and the other goes to the other amp. You can produce stereo sound using this method without having a PA system. But, the downside of this is the set up is more time consuming, requires double rigging and twice as much actual equipment. It requires a lot of work, but, the result is remarkably different from playing through a single mono amplifier. The sound quality is incredible and you get a stereo sound. Most harmony machines and will only sound fantastic in a stereo configuration when doing complex harmonies. If you are going to use one of these instruments, you need to set up a stereo speak system. Do not be under the fake impression that running two speaker cabinets out of two outputs of one amp is stereo, this is not stereo. It is just adding another speaker to give extra spread of sound. It does not add any actual power or make a stereo signal. Stereo ensures your guitar sound better and fills the room. It gives the listener more complete music experience and should be used all the time.