ARP - Odyssey Mk 2 , Soloist , Quartet , Solina , Pro-DGX - Phone jack

Arp Odyssey Mk 2 - Phone jack, 1/4-inch, mono - for audio input, low output

Arp Soloist - Phone jack, 1/4-inch, mono - for low level

Arp Quartet - Phone jack, 1/4-inch, mono - for outputs, sustain

Arp Pro-DGX - Phone jack, 1/4-inch, mono - for low output

Arp Solina String Ensemble - Phone jack, 1/4-inch, mono - for outputs,