I ordered an airbrake to control some of the noise my FTR puts out. I understand how an attenuator works. However, I'm not sure how to hook it up if I use the amp in half power mode. You know, the amp's got different ohm outputs. Normally, in half power mode with 16 ohm speakers wired in parallel, the 4 ohm option is to be used. Do I still use the 4 ohm option going to the attenuator? Or, use the 8 ohm option? The only reason I'd be using the half power mode is because there is less hum and hiss emitting from the amp. I know there was a thread that talked about this, and explained how to hook up the airbrake. But, I can't find it. So, I would appreciate it if someone would explain, one more time, how to do it. Thanks!