Can Q4 output analog stereo audio through both the 3.5mm headphone jack and the RCA red/white jacks at the same time?

Q4 will mute the RCA output when headphones are plugged in.

How do I connect Q4 to my computer with USB input?

Your other USB cables must support OTG function.

Where is the 0db position (Q4)?

The 0db position is at 12 o'clock on the knob.

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Q4 - Mini Stereo Gaming DAC & Headphone Amplifier, 24-Bit/192 KHz USB/Optical/Coaxial to RCA AUX, Digital-to-Analog Audio Converter Adapter for Home/Desktop Powered/Active Speakers - Black

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