Behringer U-phora404HD
Great, cheap, simple, 4 in 4 out with A/B headphone mix 4 Midas preamps, usb powered or 5V DC 192khz, 24 bit
about $179
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It works great, especially having four ins and outs is a life saver, I can have a custom stereo headphone mix with a metronome on 1/2 ans have the headphone out set to 1 and send out the clean mix to 3/4 to the FOH