==Manual BPM Correction==
The CBG is calculated automatically when a track is loaded for the first time. VirtualDJ uses powerful algorithms to calculate the BPM and the CBG of music (1 of 2 algorithms can be chosen - a fast but effective algorithm which works well for techno and house, and a slower algorithm which is effective on any type of music).
However, in some rare cases, the CBG is not correctly positioned on the beats of the song. In this case, you can easily carry out a manual correction.
Click on the Image:BPM_Button.jpg button.
There are several methods to correct the BPM and the CBG:
The simplest method is to beat-match the track with unknown BPM with a track whose BPM is already known, then clicking on "copy from other deck".
Image:Edit_BPM_Copy.jpg
Alternatively, the anchor method can be used.
Image:Edit_BPM_Tap.jpg
Click on "beat tap" button while the track playing, in order to approximate the BPM.
Then, pause the track, advance the track to the downbeat (first beat), and click on "First anchor". Then advance to the upbeat (second beat), and click on "Second anchor". Check that the number of beats displayed corresponds well to the number of beats between the two anchors.
Then go further in the music, and repeat the "second anchor" operation if you notice that the beats and the CBG shift. Normally two or three anchors should be enough to obtain an accurate CBG.
