- EXAKT-LINK - connection to Series3-301 speaker
- EXAKT LINK - To connect to Exakt compatible devices (Exaktbox, Exakt Speakers, Urika II etc) - connection to other Exakt-link applicable products
- SERVICE PORT For Linn service only
- FALLBACK - To put the device into Fallback mode (used when reprogramming)
- MAINS INPUT - To connect to the mains electricity supply.