Well, even though your issue turned out to be slightly different, I can help you with that, too. I looked up your Samson Q2U, and it has a headphone monitor output, just like my AT.

What you need is an attenuator (links below). Basically, line-level (or headphones out) is in the VOLTS range, but the mic input is looking for a signal in the MILLIVOLTS range. You just need to reduce the signal, so that you aren't overdriving the input.

This is similar to the one I bought: https://www.amazon.com/dp/B005DBX68O/ref=cm_sw_r_cp_apa_i_WMJtFb1QF4RDR

This one could also maintain your headphone monitor output: https://www.amazon.com/dp/B004VIOZSK/ref=cm_sw_r_cp_apa_i_wQJtFb3V6YWTS

On each of those cables, the end labeled "camera" should be connected to the mic input of the Sound Blaster. Then you just need a 3.5 mm extension cable to fit your needs, and you should be all set.

Good luck!