How to Plug an iPod Into a Guitar Amp

Purchase a cable with a stereo male 1/8-inch plug on one end and a mono 1/4-inch male plug on the other. Since the iPod plays music in stereo and standard guitar inputs are mono, this configuration will ensure that the left and right stereo signal are properly merged.
Turn the power off on both the iPod and amplifier and ensure the amplifier volume is at its lowest setting.
Plug the cable's 1/8-inch stereo plug into the iPod's headphone output jack and the 1/4-inch mono plug into the guitar amplifier input jack.
Turn the iPod power on and adjust the volume to the lowest setting.
Turn the amplifier power on and turn the volume up 3 to 4 notches.
Turn the iPod volume up until you begin to hear sound and adjust the amplifier volume and tone controls to achieve the desired loudness level and sound quality.
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How to Output iRig to Amp (9 Steps)

Connect the other end of this cable to the 1/4-inch jack on the bottom of the supplied hardware adapter. There are two jacks on the adapter, the 1/4-inch jack is the largest.
Connect the audio connector end of the adapter to the audio port on your iPhone or iPad.
Connect a the 3.5mm end of a 3.5mm-to-6.5mm cable to the 3.5mm output socket on the top of the hardware adapter.
Connect the 6.5mm end to the input on your guitar amp. A 6.5mm connector is also referred to as an 'instrument jack' or '1/4-inch jack.'
Turn the 'Master Volume' dial on your guitar to zero. It's always smart to turn the volume to zero before turning on your amp. This is especially true if you are introducing a new piece of equipment to your rig.
Turn the amplifier on. If using a tube amplifier, put it in standby mode for two minutes before putting the power fully on. This lets the tubes warm up.
Turn off any on-board effects, such as reverb, distortion or overdrive. Because the iRig app features an array of effects, it's preferable to set your amp to as clean a sound as possible so the overall tone isn't muddied by having too many effects.
Launch the iRig app on your iPhone or iPad. Select a sound option from the visual interface by tapping the screen.
Increase the amplifier volume to your preferred level.
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