NW2SIO BALANCED module:
(May be currently sold out, have a look here under ‘External’ modules. NW2S does have a website.)
8 inputs and 8 outputs each to a separate Db25 connector. You could get an 8 x 1/4” to Db25 snake to connect them. Attenuation +/- 6 dB is done within the module. The module and snake are a bit of an expense but then you are able to combine what you already have and keep using it with your new eurorack setup. The 8 outs could also be routed to an audio interface onto separate tracks in your DAW.