I just solved my own problem and thought others might benefit, since I could not find the solution using internet search.
My Realtek HD Audio manager seemed to be creating an echo on my "Line In" audio signal. I had already set the 'environment' and 'equalizer' sound effects options to <None>, but the echo persisted. I found the problem seems that I was essentially duplicating the Line In audio stream.
The first "source" I found was the HD Audio manager. You can open the manager and view the 'Line In' tab - mine had a non-zero playback volume (the slider was NOT all the way to the left for zero playback). If you want output from the HD Manager, that makes sense.
I also found out a second Line In "source". It was in the 'Line In' properties settings where I had checked off the option to "Listen to this device." When I disabled that, the echo disappeared.
To view this 'Line In' properties tab, right-click on the speaker icon in the notification area, then select Recording Devices (yes, "Recording"). Then, the tab will display in a window with the title 'Sound'. You should see the Line In device in the list. Right-click on this item and select Properties. The 'Line In' properties window pops up. Then select the 'Listen' tab. UNselect 'Listen to this device'. The echo should disappear if you're experiencing my problem.
I hope this helps someone. I'm just trying to help the community from which I've received so much help. :grinthumb
My Realtek HD Audio manager seemed to be creating an echo on my "Line In" audio signal. I had already set the 'environment' and 'equalizer' sound effects options to <None>, but the echo persisted. I found the problem seems that I was essentially duplicating the Line In audio stream.
The first "source" I found was the HD Audio manager. You can open the manager and view the 'Line In' tab - mine had a non-zero playback volume (the slider was NOT all the way to the left for zero playback). If you want output from the HD Manager, that makes sense.
I also found out a second Line In "source". It was in the 'Line In' properties settings where I had checked off the option to "Listen to this device." When I disabled that, the echo disappeared.
To view this 'Line In' properties tab, right-click on the speaker icon in the notification area, then select Recording Devices (yes, "Recording"). Then, the tab will display in a window with the title 'Sound'. You should see the Line In device in the list. Right-click on this item and select Properties. The 'Line In' properties window pops up. Then select the 'Listen' tab. UNselect 'Listen to this device'. The echo should disappear if you're experiencing my problem.
I hope this helps someone. I'm just trying to help the community from which I've received so much help. :grinthumb