How can there be 5 mixes when the unit has only 4 stereo outputs?

KLANG:vier can create 5 individual stereo mixes. A mix always consists of a stereo output pair. KLANG:vier offers 4 stereo headphone outputs and line level outputs. Mix #1, #2, #3, #4 are permanently routed to the 4 stereo analog outputs.

All 5 mixes are available via Dante. Hence, #5 can only be accessed via Dante and e.g. routed to a KLANG:quelle headphone amp or to a Dante breakout box or Dante enabled digital mixing console.