Yeah, Cliff said you'll be fine if you just use a Y adapter on the back outputs and hook up some headphones, which works fine for me.
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Austin
The back panel contains an instrument input with Fractal Audio’s signature “Secret Sauce” circuitry, a headphone output, stereo main outputs with XLR, ¼” Humbuster™ and SPDIF jacks, plus a stereo-in/stereo-out effects loop which can also be repurposed as a utility input or output.