I just found out it is possible to disable any and/or all APO(Audio Processing Objects ) under such tab in Windows 11 device manager, and still record in Audacity.
The important step is, after disabling APOs, is in Audacity to run a ‘Rescan’ of audio devices, under the Audio Setup pull-down.
I did so, with all APOs disabled, but still get the nasty 650ish Hz dip in the spectro of recorded white or pink noise:
It’s just something I’ll have to live with, and I have created in Audacity’s Filter EQ a preset mirroring the said dip - below, after applying corrective EQ:
So
Check these things
Are you using MME on your windows? Even if not go to your sound card settings
And make sure all your option sound settings are off. To include your real tek also.
This to include your mechanical connection as well if any?
IE :
Surround sound to stereo will cause a dip like this
Check for Phase issues
1)
Change your file to mono and retest
2)
In stereo files flip the polarity of one channel and retest
If this changes this you have an issue internally or from the program or site you
are recording from .
It could indicate that you may want to upgrade your drivers or get a external
DAC that would be capable of loop back and then you record wht you hear
The Hann mode does read a little different then lets say the Flattop or the Blackmann modes
Good Luck
Do not get frustrated
Everybody goes thru crap like this …
I’m not interested in those lumps and bumps because I can hear them. I’m interested because that’s exactly the kind of distortion you can get with a pathway that has bell-like tones, echos, long hallway effect, or talking into a wine glass, or milk jug.
Remember I said you can’t pass clues like that in a tough dog because “It can’t possibly be important, so we’ll ignore it.” That notch at 650Hz is not the only distortion.
Another wacky test. Record another pass of pink or white. Wait like three seconds and yell loudly at the computer. Doesn’t have to be your voice. Pound on a spaghetti pot.
Is there a difference in the recording at three seconds?
Computers only have two natural sound pathways: Play internet sounds or shows to your speakers or headphones, and record your microphone or Line-In to software such as Audacity. That’s it. There is no natural connection between the two.
If you are recording internet works, you have created a connection. That connection can have problems. A fairly common one is you turning your speakers down and your recording goes away.
There are software packages and apps that can create that connection, but they can have problems of their own. Your distortion, for example. Your 650Hz notch is not the only damage. It’s just the worst one.
This is where “That can’t possibly be the problem so we’re not going to check it” comes in.
Recording via MME or WASAPI, no matter what combination of levels, returns approx the same spectro as above: a severe dip around 650Hz, and minor bunny hills in the HF.
I can turn down my laptop speakers to a whisper or blast them 100 percent volume, no difference in the spectro of the pink and white noise. Same nasty lower midrange dip.
Ripping briefly back through the messages. You can’t record either the laptop microphone or the microphone portion of the headset connection. That’s pretty serious.
I think it’s fascinating there is one (1) computer doing this and nobody can figure out how or why. I can get scary. You’re not recording a clean, pure internet connection. You’re not the only user on your machine.
There is one note that when you have a non-standard operation, this may not be the only damage. It’s only the one you found.
If you have a good quality, fast internet connection, and it seems by the evidence you do, then it’s possible for someone to break into the machine and use some of your processing power in the background for their own jobs. Have you ever done that heavy, thorough virus check that takes all night? Will your virus scanner even do that?
As I’m doing work around the house, I did think of another even less attractive condition. Your tower used to work perfectly and only failed when the power supply fell over.
You bought the new laptop and it has been producing substandard work since the beginning. The damage isn’t ordinary or common. Many forum helper elves across multiple time zones can’t figure out why.
Do you have the purchase papers for the computer? What’s their return policy?
This is EXACTLY what is happening with me. When I listen to the recording the delay, or double play isn’t there, but I cannot record with it like that.
Where, might I ask, is this playthrough input option nestled?
I’ve read of and been told of many suggestions such as this, yet none of them appear anywhere in the settings or prefs. of my version - 3.7.1 - of Audacity.