AmpStamp 1.10 Turn It Up The Musicology Group MXR M103 Blue Box Script Reissue Pedal on ModularGrid SOLD) MXR BASS SYNTH The Canadian Guitar Forum MXR Blue Box (C11 and octave mods) : r diypedals Today's offering is a spruced up reposting of a vintage 1976 MXR Blue Box rescue. These are VERY odd pedals. On one side is a double octave down effect, and on the other ARMOUR Max Durable Dual Battery DTL Vape Kit