If you want to paste audio into only one channel of a stereo audio recording, it may not be immediately obvious how to do this in the Soundtrack Pro Waveform Editor.
For example, if you copy a section of audio from one channel, select a section with both channels selected, and then choose Edit > Paste, the audio will be placed in both channels. If you make a selection in only one channel and attempt to paste, the Paste command will be dimmed in the Edit menu.
This happens because you can't edit one channel of a stereo audio file in such a way that the two channels would become different lengths. However, there is a way to paste a single channel of audio into only one channel of an audio file. Here's how to do it:
- Copy the audio you want to the clipboard.
- Set an insertion point in the channel that you wish to paste to by clicking on the desired point in the timeline—either near the waveform's upper edge for the left channel, or near the lower edge for the right channel. The cursor will turn into a small arrow with an L or R, respectively, to indicate the selected channel.
- Choose Edit > Paste Special > Paste Mix. The following dialog appears:
- In the dialog, set "Original Material Level" to 0 (zero) percent, set "Clipboard Level" to 100 percent, and click OK to paste.
The contents of the clipboard will replace the current material in the selected channel, thus preserving the length of the channel in relation to the other.