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Grounding issue with laptop power cable/guitar

Hi,

I have a macbook pro laptop and my audio interface is the Apogee Duet 2. Whenever I plug my guitars into the Apogeeinterface I've got a hum going on. I can get rid of the hum if I take out my laptops power cable however I then have an issue of the laptop overloading frequently (not running at full capacity without power cable) and running out of battery without the power cable.

Plugging in DIN cable

Duh. I have always been afraid of 5-pin DINS. I'm trying to plugin the male end of a cable into a female connector at the base of a mic (congrats to me: I commissioned a Neumann U47 replica, and it is awesome.) I'm sure the pins are straight and I managed to plug it in last night. But today, still difficult. Any tips? This has plagued me for years.

Mytek and Focusrite World Clock. Sync via S/PDIF vs. BNC cable ?

So I just topped my credit card again, to buy a Mytek ADC 96
My plan is to connect my Focusrite ISA two to the Mytek, then the mytek to my Focusrite Liquid Saffire 56 via spdif.
I also have a Octopre which is connected to the saffire 56 via ADAT.

I read the Mytek has a good clock so I want it as the master clock.

x

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