One note becomes many notes... that's the dream. This has a stack of polyphonic arpeggios on deck to add pizzazz and confuse to your parts. Obviously it works on guitar, but you could have fun pairing this with synths etc too. I may be Arpanoid, but no android. 

Model: EarthQuaker Devices Arpanoid Polyphonic Pitch Arpeggiator
Made: Akron, USA, recent model (serial missing)
Type: arperggio/synth
Power: standard 9v negative supply (not included)
Switching: true bypass
Equivalent new street price (approx): $399aud
Mods: dual-lock attached
Accessories: no box or manual
Condition notes: used, no major marks, fully functional. Overall: very good condition