I am recording from vinyl some of which is 40 years old, I am using a turntable which is part of an intergrated system involving CD player and stereo radio. in between the laptop and the music system I have linked a Behringer USB audio Interface UFO020. The channels on the Audacity screen are showing identical waveforms. The same had happened when I have recorded from a music DVD - using a DVD player and the Behringer.
The device may say something like “USB Audio Codec” or something like that.
The UFO-202 can be used as a raw turntable preamplifier as well as a straight Stereo interface. There’s a switch on the device.
See how far you get with that. There’s another signal test you can do. Plug a straight RCA to RCA cable into the UFO-202 instead of the entertainment system and touch one tip at a time while you’re recording. You are intentionally creating sound buzz as a test, and it should appear on one side or the other.
You should be plugged into the connectors labeled “Input.”
Sometimes Windows thinks a USB audio device is a mono USB microphone. See [u]this page[/u].
Another simple test is to unplug the left & right channels one at a time to see what happens when only-left or only-right is connected.
The channels on the Audacity screen are showing identical waveforms.
I wouldn’t go by how the waveforms look… Usually there is lots of similarity between the left & right channels. If you want to “prove” the left & right channels are identical, you can use the Vocal Remover effect with the frequency range set to 0 20,000. That will subtract the left & right channels giving you dead silence when the channels are identical.
I am recording from vinyl some of which is 40 years old…
…The same had happened when I have recorded from a music DVD -
Most 40-year old records (1974) are stereo. But if you go back to the 1960s, there were still quite a few mono records. If you do the “subtraction trick” of a mono record (with a stereo recording) you won’t get dead silence… You’ll get record noise and any analog differences in the channels.
And, I have older movies on DVD that are mono. I even have a concert video from 1992 that’s mono, but that’s unusual.
It’s worth finding yourself an LP that has distinctly different left & right channels to test - my gold-standard for this is the opening track of Sgt Pepper (stereo release of course not the mono version).
it is a UF0 202 and the recording was set to stereo, I have tried both the phono and the line but after making the change identified in the last post I have a better signal from the line as opposed to the phono. I have not yet had time to try the RCA to RCA approach (I will have to see if I Can get one).
Thanks - I have tried the “Vocal Remover” - there was no noise and the waveforms were horizontal. By removing the plugs one at a time there was no effect when the “left” was removed and when the "right was removed it seemed to stop the recording.
I am not aware of a mono switch, I am not sure of your first question I have linked the Left and Right sockets on the back of the system with input left and right sockets on the Behringer. I have used the earphones socket on the system this morning and it did come out in stereo.
I tried again this afternoon and had a different result. There was a difference between the 2 channels some of the time and the size of the waves forms was different. There is another problem - there is a buzz/hum throughout the recording. Do you think this is a situation where “earthing” is needed - if so the RCA cables I am using to connect the system and Behringer has an earth at both ends, I can see where it attaches to the Latter but where would I attach it to the back of the system?