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RANE SL3 FOR SERATO SCRATCH LIVE • OPERATOR’S MANUAL 2.5.0

How to Calibrate Scratch Live

With music playing in the background

(from any source), put your needle on

the record with the turntable stopped.

If you are using CD players, the same

rules apply. Have the CD deck paused

or stopped while calibrating. Ensure the

input level in Scratch Live is set correctly

to accept a LINE level signal. See “Line /

Phono Status” on page 32.

Click and hold the estimate button

until the slider stops moving. Moving

the threshold slider to the left will make

Scratch Live more sensitive to slow record

movement, but also more sensitive to

background noise.

Repeat the process for each deck.

Things to remember:

• Your needle must be on the record.

• Your turntable (or CD player) must be

stationary.

• The background music playing must be

at a similar level to which you will play

your set at.

• Calibrate Scratch Live every time you

play.

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 REL mode. See

“Calibration Troubleshooting”.

The Scopes

The scopes on the Setup screen in

Scratch Live display the input signal as a

phase diagram. The key factors to look at

on the scope display are crisp clean lines,

round shape, and the tracking percentage

in the lower right corner.

Calibrating

Scratch Live

Since Scratch Live is controlled by an

analog signal, there is no guarantee of

what state that signal will be in by the time

the software gets to interpret it. Therefore,

Scratch Live needs to be able to handle a

wide range of signals, and be congurable

to use them optimally. Calibrating is just

conguring the software to your situation.

Calibration is equally important for both

vinyl and CD users of Scratch Live.

There are two parts to the Scratch Live

control signal: The directional tone, and

the noise map. Listening to the control

vinyl, the directional tone is the 1 kHz

tone. The noise map sounds like random

noise over the top of the tone.

The directional tone provides the

current speed and direction of the record,

while the noise map tells the software

precisely where on the record the needle

is currently.

The Noise Threshold

A threshold is a lower limit, below which

a process will not occur. In the case of

Scratch Live, the noise threshold is the

limit below which the input signal will not

be interpreted as control signal; in other

words if it’s below the threshold, it is

considered noise and ignored.

This setting is necessary because a

stylus is very sensitive, and will inevitably

pick up noise from the environment as

well as the signal on the record, especially

in the noisy environment of a live show.

Start both turntables or CD players. You

will see green rings appear in the scope

view as shown above.

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.

The number in the top left corner of the

scope view gives the current absolute

position within the control record or CD.

The number 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 close to 85% when

your system is calibrated properly.

Calibration Troubleshooting

After calibration, the number in the upper

right corner of the scope view should say

0.0 while the needle is on the record and

the turntable is stopped.

If that number is uctuating then

manually move the Estimate slider to the

right until that number is stable at 0.0.

If you’ve moved the slider all the way

to -24 and its still uctuating then you

have a grounding or interference problem

somewhere in the chain.

If so, the rst thing to check is that

the grounding wire coming from your

turntable is connected to either your SL3’s

or your mixer’s grounding posts.

Next, make sure that the SL3 isn’t

sitting next to a power source such as

a power strip or power box and that the

RCA cables connected to the SL3 aren’t

laying across other power conducting

cables.

If you are still experiencing issues, you

might have to adjust the placement of

your setup. For example, make sure bass

bins aren’t directly under the turntables.

for more calibration troubleshooting

help See “Scope Reading and Fixes” on

page 38.

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