2 Chained Passive Multiple
Two chained simple Passive Multiple.
Each group is 3 inputs and 1 output. Of course, in a passive Multi, there's no difference between an input and an output. Output here is just for chaining purpose :
When Output 1 is not plugged, signal is redirected to the second group.
Or, use it as two independant multiples. Simply not connect the two PCBs.


http://www.davidhaillant.com/passive-multiple/
Available as an assembled Module and as a DIY project.
This Module is currently available.
$30