When ever I have focus on a DDO window (either windowed or full screen), I get an annoying hum. It will change volume and pitch depending on what I am doing. If just standing it is usually fairly soft but still clearly audible and at a low frequency. It I start spinning around it gets louder and higher pitched. It usually also gets higher pitched and maybe louder when I am running.
I do not get the hum though the headphones for voice chat (mic and speakers).
I do get the hum even if I set to minimum all effects on the audio options page.
I do get the hum even with the head set unplugged so no microphone.
I stop getting the hum if I am in windowed mode and I click outside the window, or if in full screen and I do a control alt delete.
I normally use a television for my monitor and speakers for all except voice chat. The hum also appears on my Logitech speakers when connected (2.1) and on my Vizio speakers when connected (5.1). It is much louder on the computer speakers and I think it might have actually damaged the base on the Logitech speakers.
I do get the hum even when I use Microsoft and set the audio to minimum (0) and when I mute the speakers.
I can only get the hum to disappear by turning the volume on the hardware (volume adjustment on speakers and on television) to so low it cannot be heard (all sounds gone).
To my knowledge the problem only appears when in a DDO window. I have tried reproducing in Firefox, Magicjack, WinTV7, VLC, Mediaplayer, and several other computer games.
I have searched the web for information on possible conflicts between Realtek and DDO. I find nothing. I know the following information is probably overkill but hopefully someone can see something I cannot.
Typically I have the following programs running: AwesomiumProcess(x7), conhost.exe, csrss.exe, dllhost.exe (COM Surrogate), dndclient.exe*2, dwm.exe, explorer.exe, firefox.exe*32, FlashPlayerPlugin_13_0_0_214.exe*32 (x2), F-Secure (FSM32.EXE*32, fshoster32.exe*32), IAStorIcon.exe*32, NVidia Software (NvBackend.exe*32, nvstreamsvc.exe, NvTmru.exe*32, nvtray.exe, nvvsvc.exe, nvxdsync.exe) plugin-container.exe*32 (firefox), ramdiskws.exe (SoftPerfect RAM), RAVBg64.exe, RAVCpl64.exe, SwUSB.exe, taskhost.exe, taskmgr.exe, winlogin.exe, and YahooMessenger.exe (x2).
I have removed all but AwesomiumProcess(x7), conhost.exe, csrss.exe, dllhost.exe (COM Surrogate), F-Secure (FSM32.EXE*32, fshoster32.exe*32), NVidia Software (nvstreamsvc.exe, nvvsvc.exe, nvxdsync.exe) RAVBg64.exe, SwUSB.exe, taskhost.exe, taskmgr.exe, and winlogin.exe and the hum does not go away.
I keep Windows 7 Professional version 6.1.7601 Service Pack 1 Build 7601 with all patches through May 9, 2014 (autoupdate on Fridays at 03:00 Central US time and it did run last Friday I know).
My hardware is:
ASRock Z87 Extreme 3 motherboard
32GB PC1600 DDR3 memory
EVGA NVidia Geforce GTX 760 with 4GB memory x2 in SLI configuration
Hauppauge TV tuner card
Audio controllers listed in Device Manager (Starred I see in DDO Audio options)
Hauppauge WinTV HVR-1255 (Model 22xxx, Hybrid ATSC/QAM)
* Logitech USB headset (I use for the voice chat)
NVIDIA High Definition Audio (on video card 1, I think)
NVIDIA High Definition Audio (on video card 2, I think)
NVIDIA Virtual Audio Device (Wave Extensible) WDM (I have no idea where unless on video cards also)
* Realtek High Definition Audio (on motherboard)
On audio options screen Sound Playback choices are:
Generic Software on Speakers (Realtek High Definition Audio)
Generic Software on Speakers (2- Logitech USB Headset)
Generic Software on Realtek Digital Output (Realtek High Definition Audio)
I have tried both choices 1 and 3 and both hum. I cannot choose the Logitech USB headset. I think it is because set for Voice Playback Device and Voice Capture Device. I do not know why the NVIDIA High Definition Audio and NVIDIA Virtual Audio Device do not appear in the list.