Soundtrack panel contains a waveform view of the soundtrack and on top of it displays synchronized lyrics labels.
Top of the soundtrack panel contains the name and the length of the current soundtrack file. Also current cursor position and zoom are displayed.
Zoom corresponds to the number of samples shown by one pixel. Zoom 1000 means that every pixel on the waveform display represents 1000 samples. Karaoke soundtracks have frequency of 44100 samples per second, so at zoom 1000 44 pixels represent one second of music.
Use the arrows to modify the zoom. Higher values will show more of the screen on the file, increasing the density. Lower values will give more detail.
Preview bar is displayed on the left. It represents an entire file. The current part of the soundtrack is represented by a window on the preview bar.
Click anywhere in the preview bar to position the cursor.
Use arrows to move back and forth in the soundtrack.
You may extend the visible window by dragging its edges (see image above). It has the same result as changing zoom value.
Click at the bottom of the visible window and drag it to move the window.
The horizontal yellow line is a cursor. It represents current position in the file. When you play the music the cursor will move. Click anywhere on the waveform or on the preview bar to move the cursor to the new location.
Labels are synchronized words. The horizontal red lines are start and end points. Label is attached to the start point.
Soundtrack panel can be used to adjust the start and the end of the word. This can be done in many ways.
To move the entire word click on the label and move it up and down. The word's duration will not be changed. The duration of the previous and the next word will be modified accordingly. You may not move the word earlier then the start of the previous word, and later than the end of the next word.
In this example you see mouse pointer on label 'good'.
To move the end of the word and the beginning of the next word position click and drag the word boundary (the red horizontal line).
In this example end of word 'a' and start of word 'good' would be adjusted.
To move the start/end of the word without moving the end of the previous/next word hold down the SHIFT, and then click and drag the word boundary.
Only the beginning of the word 'good' would be moved.
Only the end of the word 'good' would be moved.
To place a cursor over the label boundary keep the CTRL key down and click as if label was not there.