The Arp Axxe is a single VCO mono-synth with sawtooth and square/PWM waves, like a scaled-down Odyssey. It can be interfaced with other synths via connections for CV and Gate on the rear panel. The Mark 1 is black and gold, with wooden end panels, while the Mk 2 has an orange motif, and has Arp's PPC pads for expressiveness.