Manual-5
Calibrating Scratch LIVE
e Scratch LIVE hardware interprets the signal on record and communicates with the software. e signal needs to be clear for
Scratch LIVE to perform well. is section describes how to calibrate Scratch LIVE to optimize reading the control signal from your
turntables or CD players.
For best results, you should re-calibrate Scratch LIVE each time you move or make changes to your DJ equipment. To calibrate
Scratch LIVE, go to the
setup
screen by pressing the button at the top of the main screen, to the right of the Scratch LIVE logo.
Audio input level
By default Scratch
LIVE is set to accept phono level inputs. If you wish to use CD players,
switch to
line
level input. is preference is stored when you exit Scratch LIVE.
Signal threshold
e first step is to set signal threshold. ere is always a certain amount of background noise, particularly when using turntables
in a club environment. With a normal turntable setup, this background noise is transmitted through the body of the turntable and
platter to the stylus, and can cause stylus feedback. In Scratch
LIVE, this can cause the errors on the reading of the position and veloc-
ity of the control record.
Place the needle on the record with the record stopped. Click the
estimate
button to measure the background noise and
estimate the appropriate threshold. Moving the threshold slider to the left will make Scratch LIVE more sensitive to slow record move-
ment, but also more sensitive to background noise.
Tip: If the slider jumps to the far right, then you have a problem with noise in your turntables/CD players/mixer. Check all your
connections and make sure your equipment is well earthed. In some situations you will not be able to improve the signal quality, and
you will have to play on regardless. In this situation, stick to
Relative
mode. (See page Manual-11 for details)
Scope view
Once you have set the threshold, start both turntables. You will see green rings appear in the scope view, as shown below.
For optimal performance the inner ring should be as close to circular as possible. Use the scope zoom slider (
1x
to
16x
) to zoom
in or out as necessary. Use the scope
L/R balance
and
P/A balance
controls to adjust the shape of the inner ring.
e number in the top left corner of the scope view gives the current absolute position within the control record or CD. e num-
ber in the top right corner is the current speed in RPM. In the bottom left is the current threshold setting, and the number in the
bottom right shows the percentage of readable signal – this number should be 100% when your system is calibrated properly.
Tip: if you have trouble getting the rings circular, you probably need to change your needles. If the image appears as a line, then
one of the channels of the turntable is not working.
Tracking light
e
Tracking
light on the main screen provides an overview of the signal quality. It should be
green when tracking correctly. If it is dim, or red, go back to the
setup
screen and check your calibra-
tion. If this does not help, check your hardware. Problems may be caused by dust on the needle, bad
cable connections or dirty control vinyl. Note that it is normal for the light to be red when scratching.”
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