Crackling Pop - Please help

[tomyco]

I have a Pro Tools LE, Mac Pro, Digi 002 Rack, M-Audio Octane set up. Every 15 seconds I'm getting a crackling pop sound. Can anyone walk me through it to correct this. I'm new ar this so, easy on the terminology.

My hardware set up is the following;

Peripherals - Digi 002
Clock source - internal
Digital input - RCA

I also have the Octane and Digi 002 rack sample rate both at 44.1

Thanks!

[Slim Shady]

Try this in your hardware setup:

Clock Source: External
Optical Format: ADAT