The Eurorack output module gives you a versatile option to either connect your modular to a mixer or amplifier, or to drive some headphones with it. There are controls to attenuate the line-out and the headphone’s volume. The left input can be used as a single mono input.
Technical details and assembly instructions at https://polykit.rocks/out
Disclaimer: Kits or PCBs like this require a certain experience to assemble. A set of tools and basic understanding of electronics and components are required. Please take great care while assembling it. All kits and PCBs are sold at the purchasers risk. Used or assembled kits can't be returned.