Stereo/headphone output module

The XOH (miX Out Headphone) music synthesizer module is a stereo mixer, headphone amplifier and output interfacing module for your modular synthesizer. It consists of two stereo input channels with independent level controls, and two stereo outputs: one pair of independent line level left and right outputs at unity gain; and one TRS headphone or line level output with dedicated level control.

http://www.makenoisemusic.com/modules/xoh