I know this is probably rudimentary, but I am new to Audacity and I can’t get it done. I want to create a stereo 1K test tone with one channel 180 degrees out of phase of the other.
Windows playback “audio enhancements” can introduce cross-over between left & right channels
https://support.microsoft.com/en-gb/topic/disable-audio-enhancements-0ec686c4-8d79-4588-b7e7-9287dd296f72
[ There can be a second layer of audio-enhancements which need to be disabled. ]
Thank you very much Trebor. Is there a way to increase the output? I get 37mv from the clip. I need more like 1v.
Run the Amplify effect. 0dBFS is the “digital maximum” and it will default to that.
The actual voltage depends on your soundcard (or amplifier or whatever). A full-volume line-level or headphone-signal will be in the ballpark of 1V.
P.S.
To flip the phase/polarity of one channel:
Split Stereo Track allows you to edit/process the left & right channels separately.
Select one of the tracks, then Effect → Special → Invert.
“Teach a man to fish…” 
One way is to use the Nyquist Prompt:
- Create a new stereo track (“Tracks menu > Add New > Stereo Track”)
- Open the Nyquist Prompt effect
- Copy and paste this code into the Nyquist Prompt and run it:
;type generate
;control HZ "Frequency" int "Hz" 1000 0 10000
;control GAIN "Amplitude" float "" 0.8 0 1
;control LPHASE "Phase left channel" int "degrees" 0 -180 180
;control RPHASE "Phase right channel" int "degrees" 180 -180 180
;control DUR "Duration" int "seconds" 30 1 300
(if (= (get '*selection* 'channels) 1)
(print "Error.\nA stereo track must be selected.")
(let* ((pitch (hz-to-step HZ))
(left (osc pitch DUR *sine-table* LPHASE))
(right (osc pitch DUR *sine-table* RPHASE)))
(vector left right)))
Thanks Steve. This is just what I needed. I was able to adjust my equipment with your tone generator. Much appreciated.
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