Hey Cody,
The iRig Nano Amp is not designed to connect directly to a mixer using the 1/4" output, this is for powering a passive speaker cabinet. To connect this device to a Mixer I would suggest using the headphone port on this device with an adapter like the iLine Mono-Output Splitter.
Read more on this adapter at the link below.
https://www.ikmultimedia.com/iline/