Graph guides

Moved to Audio Processing - it is not a feature request
I’ve been searching a little, but strangely, nobody seems to have this problem.

When I’m cropping sound, I need to avoid crackly sound in it when the sound is not cut at 0. However, it’s quite tricky to pick the sound at zero then there is no guide line:

Red line exactly depicts what I need.

Which version of Audacity are you using? (look in “Help > About Audacity”.

In the current Audacity 2.0.5 there is (or at least “should be”) a horizontal line at zero, as shown in this screenshot:

The best way to avoid crackly sound is to interpolate the signal. Make a small selection around the crop “moment” and use Effect > Repair.
It works perfectly, like magic!