It sounds like a problem I have with my computers sound card and my m-box.Anything audio played on Internet Explorer will only play back on my computers sound card and not thru my m-box,even if I select for all audio playback.
Your situation,seems like you have to switch something between record input and audio playback.When i record thru my m-box I have to turn the knob to input and when I want to play back the audio I have to switch it to Playback mode.
You should look for something kind of switch or knob you have to toggle or turn between both options.