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There are several methods to correct the BPM and the CBG:
Simplest consists in fixing the disc to be corrected with a track whose
BPM is already known, then to click on "copy from other deck".
Alternatively, you can use the method of the anchors.
Click on "beat tap" button during along with 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.
Go then further in the music, and repeat the operation "second anchor" if you notice
that the beats and the CBG shift. Normally two or three anchors should be enough to
obtain a CBG which is accurate on the beats of the beginning until the end of the
track.
Beat match
The button beat match allows two tracks to play in sync.
With the first click, VirtualDJ will adjust the pitch (if that were not already done
automatically with the loading of the song) in order to equalize BPMs, then fluidly will
catch up with the music of other player as long as you keep the button press
(attention: keep the button pressed until the tracks sync, a simple click will cause only
to modify the pitch).
To carry out synchronization, VirtualDJ will accelerate or slow down the
player over one duration ranging between zero and a beat. Thus, the
correction is done fluidly.
Loops
The button enables you automatically to loop the track in progress to a measure
(4 beats).
You can modify the number of beats on which the loop is carried out:
• Using the center panel (called « Remix »),
• Using the right mouse button while clicking on the left part of the
button to decrease the size of the loop, or on the right part to increase it.
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The peaks in the curve represent beats. In order to synchronize the music, these
peaks thus should be overlapping and together as one. The present is represented by
the feature in the middle of the screen. All on the left was already played, while what
is on the right represents the next seconds of the track.
You can zoom in or zoom out the display using the scroll wheel of the
mouse. You can also pass from a very tight zoom, useful for fixing the beats
well, at a much zoomed in sight, visualizing the rhythmic sections and
breaks.
Below the curves there are small squares, Named CBG (Computed Beat Grid), that
represent the position of measures. The large squares represent the beginning of a
measure 4:4 time.
This CBG is particularly useful for example to mix a disc at the time of an intro where
the beat is not yet present.
The CBG is calculated automatically when a track is loaded for the first time in
VirtualDJ.
VirtualDJ uses powerful algorithms to calculate the BPM and the CBG of a music (you
can choose between fast but effective algorithm on music techno or house, and an
algorithm a little slower, but effective on any type of music).
However, in rare cases which the CBG is not correctly positioned on the beats of the
song. In this case, you can easily carry out a manual correction.
Manual BPM Correction
Click on button "BPM" to modify the BPM manually.
