If you copy or move audio from one window to another and the sample rates of the two files are not the same, the copied/moved sound plays back at the wrong pitch (speed). WaveLab Pro warns you if this is about to happen.
While mixing sample rates can be used as an effect, more often than not, it is not intended. You have two options to prevent sample rate conflicts:
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You can convert the sample rate of the source file to the same sample rate as the destination file before editing.
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You can convert the sample rate of the destination file to the same sample rate as the source file before adding the audio.