Ohhh something I should ask before you go out and buy new chords.
What MacBook do you have.
What one of the stock chords are you using? 6-pin - 6-pin FW or the 6-pin - 4-pin.
If you are you the 6 to 6 then im not to sure what the issue would be. The device should take its power from the laptop. Although you might wanna try to plug it in anyways.
If you are using the 6 to 4 then you will need to plug the device in because the 4 pin port does not provide enough power to run the device.
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The system I am using is a 13.3" UniBody MacbookPro 2.53ghrz 4gbRam Running Leopard 10.5.8
The Firewire port is a FW800 port which is a different piece all together. Thats why I had to buy a new chord. Which is a Dynex with a FW800 to FW400 6-pin adapter.
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Something you may want to try is to plug your device into your system, then into a power outlet.
Then go into Applications > Utilities > Audio MIDI Setup
and see if your Amp shows up there first. You should have some basic setup to do there.
Afterwords go into your System preferences and see if you can select the ScratchAmp as your system sound device.
Then try out Traktor and any other audio apps you may be using.
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