DP88 hook up -help -Jim Rosebery and others-see last post. in Gear [NEW!] Posted October 13 2 hours ago, Michael Fogarty said: This is my favorite line --"As long as everything is properly functional, it has to work." 😁 It's a simple phrase... but certainly true Tosklink the the optical port used to carry either Optical S/PDIF or Lightpipe. I've used a LOT of different (Tosklink) Lightpipe/Optical-S/PDIF based gear over the past three decades (digital mixers, audio interfaces, external converters, keyboards, etc). It's always worked. If something is defective, that's an entirely different matter.