Link from Erica Synths is a five-way passive attenuator for direct conversion from modular to line level. Since the audio levels of Eurorack equipment and desktop or studio equipment differ significantly, it makes sense to match them.

With Link this is done directly fivefold including "bridging" to the 6.3 mm mono jack which is common outside the Eurorack world. The module is not suitable for CV & Gate signals, since these are standardized levels and values.

So if you want to connect, for example, up to five complete signal paths suitably prepared to effects devices, the DAW interface or a mixer, Link is the best choice.