Lone Wolf Audio Acetylene Nirvana VCF Sample Hold Ultra - UsedLone Wolf Audio's Acetylene Nirvana packs a treasure of wild, modulated voices within its casing ranging from phaser to filter to sampler. The Acetylene Nirvana's sampling power introduces live Hold samples into the mix while playing to make for some true wackiness. This Lone Wolf Audio Acetylene Nirvana is in very good condition and is fully functional. There is Velcro on the back.