It sounds like the output device for the listen feature of the microphone is still set to your onboard audio. I've ripped the following steps from here.

Step 1 Right-click the speaker icon in the Windows 7 Notification Area and select "Recording Devices." (If the speaker icon isn't visible, click the small arrow to the left of the Notification Area.)

Step 2 In the Sound window on the Recording tab, find your microphone in the list of recording devices and double-click it. The default microphone is indicated by a check mark in a green circle.

Step 3 Select the "Listen" tab and check "Listen to this device."

Step 4 Click the "Playback through this device" drop-down menu and select your E10K.

I noticed your crosspost on /r/audiophile tech support as well. If these steps do solve the problem for you, feel free to remove that post.