Hmm...let's see, I ask a simple question and you come straight out with a holier than thou attitude and and I'm the jackass, eh? Well, you are clearly smarter than me so I guess I should just defer to you in all your wisdom. My point is simply that since you totally omitted one of the selections on the assign knob, and offered nothing helpful in any way, that maybe you should have not posted instead of just beaking off and practicing your use of bold tags. If you have something helpful to say about how to set the knobs to get the footswitch to toggle the loop on and off then by all means say it. If all you want to do is yap and give attitude, then be prepared to take some back.
My initial response was quite humane. Your response to my initial one was where we started shooting off into some tangent of being smart asses. I don't know of an option I omitted on the assign knob. Simply, there are two knobs. One for channel changing and one for the loop. One of your responses appeared to say that if you have the footswitch enabled, the loop is always on. This is not the case. If that is not what you meant, then fine. I thought you were talking about the channel changing knob.
To answer your question, turn the knob on the right (when looking at the back) that is used for channel assignment to the footswitch option. Then, on the knob on the left, turn it to the loop on option. The solo and output knobs should work in this config (just an aside). This would be the best way to test if the fx loop working. Something like a really fast delay or a heavy chorus so you'll know it's on. Make sure you set your mix knobs for your effects loop well enough. 12 o'clock on both should be fine.
Now put the footswitch in there and test it out. Set all functions to be controlled by the footswitch. You should be able to toggle the loop on and off via the footswitch. If the light on the footswitch does not come on, it could be that the light is burnt out (is it led, I don't know). If you find that the fx loop is not coming on when you push the button and the light on the BigFoot is not lighting up, it could be that the toggle switch on that particular part of the BigFoot is not functioning. It could also be that there is something wrong with your effects loop.
As an aside, the last time I had an issue with my effects loop, the amp wouldn't make any sound. It turned out to be a tube issue. You might check the tube for the effects loop...although, if the footswitch is not lighting up and not turning on the effects loop, you'd have to lean to the toggle switch not working properly. The footswitch just sends a midi signal. The light could toggle on but the loop on the amp may not be on. This, however, is not what you're describing.
Now test the solo button. It should work as well. When the loop is in bypass mode on the back of the amp, you should get nothing from the output, solo, or fx loop. The bypass of the loop defeats the output knob, solo knob, and the fx loop. A global shut off, if you will.
As for the popping noises when switching channels, does it do it when you switch the channels using the knob on the back? That's a good way to test. I suspect it will since the footswitch is only meant to send midi messages to the amp telling it which channel to go to.
There. Successfully bypassing any smart ass comments. I own the amp, you own the amp, we can co-exist as amp owners who generally like the same sound. I'm not one for arguing over the "internets". It's lame.
And yes, I'm a
pro at using bold tags. It tends to draw attention to things. And as you have pointed out my ability to take advantage of this particular BBS feature, I will assume that the attention harvesting was successful.