Sound Delay

Using Windows 7, Audacity v. 2.1.2, don’t recall the install method
Using a Tascam D-40 recorder for live music. Record 2 stereo tracks using the internal mics and a left-only track using an external line-in. There is a delay between the two resulting in a barely noticeable echo. Is there a way to remove the time difference using the Track Align function? I couldn’t figure it out. Also, is there a way to determine the amount of delay (in ms) between the two?

You’ll probably have to zoom-in on the waveform, before using that time shift tool.

see … http://manual.audacityteam.org/man/latency_test.html

… Also, is there a way to determine the amount of delay (in ms) between the two?

If it’s an acoustic delay, for example the line-input coming from the stage (with almost no delay) and the mics picking up sound several feet (or meters) back at the mixing desk, sound travels at about 1foot per mS. You can look-up the exact speed of sound if you know the exact distance. 50 feet is about 50 mS, and that’s enough to hear.

Trebor and DVDdoug, Thank you both for the help!