If you don’t own an Intellijel case with built-in compatible ¼” jacks, then you need to purchase a Stereo Line In Jacks 1U module, which connects via ribbon cable to the Stereo Line In 1U module to provide ¼” TRS input jacks for interfacing with other studio or stage gear.
Specs
Width
8HP
Depth
39mm
More info, https://intellijel.com/shop/eurorack/1u/stereo-line-in-jacks-1u/