Audacity Forum

"Overdub" should be on (selected). This tells Audacity to play other tracks while recording a new one. "Software Playthrough" should be off (not selected). With those two set, try changing the Playback device to: HDA ATI SB: STAC92xx Analog (hw:0,0) (recording device set to: C-me...

Try changing the Playback device to: HDA ATI SB: STAC92xx Analog (hw:0,0)
(recording device set to: C-media usb audio device(the microphone) )

If that does not work, try setting the Playback device to "front".

If you want to make the whole mix quieter without altering the balance between the channels, you have to make each track quieter (move the gain slider leftwards) by the same amount. It's probably easier to make "all tracks quieter by the same amount" by selecting all tracks (shortcut: Ctr...

What are the available options for the Recording and Playback devices?

One way that you could solve this would be to use a program that supports "ASIO" for doing the recording (you can still use Audacity for editing if you wish). ASIO allows software playthrough with very low latency, but due to licensing restrictions Audacity cannot be shipped with ASIO supp...

I don't have a UCG102 and I can't find on the Internet if the device has hardware (zero latency) monitoring. A couple of sales sites say that it has, but it does not say so in the (rather brief) manual. If it has, then I would have expected that the guitar would be audible (though perhaps at a low l...

Perhaps the "Karaoke" command would also be of interest to you: http://manual.audacityteam.org/man/View_Menu#karaoke

Audacity does not yet support multi-channel playback.
Mix the tracks down to a single stereo track and use the "Amplify" effect on the mix to bring the level to less than 0 dB.

What settings do you have in the Device Toolbar?
Are you able to play the track that you have recorded?

Apart from the final point (show spectrum), it would be much easier to use Sox than Audacity for your tasks. Sox is designed specifically to be run from the command line.