Troubleshooting common playback problems using the Scope views

Calibration : Troubleshooting a line in the scope view

A straight line in the scope view means that Scratch Live is not receiving a needed stereo signal.  Another turntable or cdj can aid in the trouble shooting process. The steps below can help isolate whether the problem is coming from the turntable, needle, or input of the Scratch Live hardware.

1. If you get a circle on the other side swap the needles.

Line in Left scope - Circle in Right scope
Line in Left scope - Circle in Right scope

I’ve swapped the needle from the right deck and attached it to the left turntable. Does the problem follow the needle or does it stay on the same turntable?

Circle in Left scope - Blank in Right scope
Circle in Left scope - Blank in Right scope

2. If you now get a circle on the left side then we know both turntables and both inputs are able to send an even stereo signal. The problem is your needle.

Line in Left scope - Blank in Right scope
Line in Left scope - Blank in Right scope

3. If you still get a line in the left scope view, return that needle to the right turntable. Play the right turntable again and confirm you are getting a circle.

Blank in Left scope - Circle in Right scope
Blank in Left scope - Circle in Right scope

4. Plug the right hand turntable into the left input of the Scratch Live hardware.  Are you now getting a circle in the left hand scope view?

Circle in Left scope - Blank in Right scope
Circle in Left scope - Blank in Right scope

If so, we know both inputs of the Scratch Live hardware is capable of receiving an even stereo signal.

5. If you get circles on both inputs of the Scratch Live hardware with one turntable, but only a straight line in both inputs with the other turntable, I would suspect you have bad wiring in the turntable giving you the line.

6. If both turntables give a circle on one side and both give a line on the other input, I would suspect the Scratch Live hardware as the issue. If this is the case, call 425.355.6000 and have your serial number from the unit handy.

CDJ USERS

1. If you are getting a line in the scope view, first try a new set of RCA cords connecting the cdj to the Scratch Live hardware.

2. If that does not resolve the issue and you are getting a circle in the other scope view, move that cdj to the input currently giving you a line in the scope view.

3. If you get circles on both inputs of the Scratch Live hardware with one cdj, but only a straight line in both inputs with the other cdj, I would suspect you have bad wiring in the cdj giving you the line.

4. If both cdj’s give a circle on one side, and both give a line on the other input, I would suspect the Scratch Live hardware as the issue. If this is the case, call 425.355.6000 and have your serial number from the unit handy.

Squares in Scope View

The most common cause for squares in the scope views is that the wrong “Audio Input Level” has been set for the software. This should only happen with cdj’s or turntables that have the ability to output at Line level.

Squares in both scope views
Squares in both scope views

1. Change your “Audio Input Level” to Line.

Sl-1 users – Open the software with the hardware attached and go into the Set-up / hardware tab. Click on LINE in the “Audio Input Level” section.

Sl-2 users – Make sure the white dip switch on the SL-2 is set to “CD”.

SL-3 and Sl-4 users -  Make sure the white dip switches are set down to the “CD” position.

TTM57 users – Make sure the white dip switches on back of the mixer are up in the “Line” position.

Sixty Eight users – Makes sure the white dip switch is set to “L” above each input.

After doing so, you should now see circles instead of squares

Circles and 33.3 RPM in both scopes
Circles and 33.3 RPM in both scopes

Circles in the scope views, 100% tracking but decks playing backwards

If this is the case, the number in the upper right hand corner of each scope view will likely read -33.3 or -45.

Circles but -33.3 RPM in both scopes
Circles but -33.3 RPM in both scopes

1. Make sure your device is playing the control source forwards. Often times with cdj’s there is a “reverse” button. Make sure this is not selected.

2. Try a new set of RCA cords.

3. Leave the RCA’s connected to the control source. In the location those RCA’s connect to your Scratch Live hardware, reverse them. Put the White RCA into the red hole and put the Red RCA into the white hole.

Circles and 33.3 RPM in both scopes
Circles and 33.3 RPM in both scopes

Circles in the scope view but no tracking percentage or low tracking %

If you see circles in the scope view and you can control the waveforms but you have 0% tracking or low tracking% (lower right hand corner of playing scope view) Your “Threshold” may be set to high.

This is usually caused by the “Threshold” slider being set to 24, which blocks some incoming signal.

1. Move the Threshold slider back to 48. You should now get a solid tracking percentage.

2. Calibrate as you normally would

                                                        No Grids in Scope View area

Scratch Live hardware connected to USB hub
Scratch Live hardware connected to USB hub

1.. This could be caused by a USB hub. Make sure you connect your Scratch Live device directly to the computer.

Control records or control CDs stopped, Virtual decks moving backwards, number in upper right hand corner of scope view fluctuating

This is due to the decks not being properly calibrated. In a pinch, you can manually move the “Threshold slider” closer to 24 until the numbers stop fluctuating

RPM numbers fluctuating when control source is stopped
RPM numbers fluctuating when control source is stopped

Excess background noise, vibration and RFI can cause a virtual deck to move and “grumble” even when you are not playing the control source for that side.

To prevent this, make sure to properly calibrate each time you enter a different sound environment. Here is a link to that tutorial – /howtos/scratchlive/1913/how-to-calibrate-scratch-live


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