Amp attenuators

[junkemail86]

I've been thinking about building an attenuator for my amp (40 watt Marshall).  I don't see too much discussion here about them.  Anybody have much experience and recommended builds?  I don't see a huge advantage to the Airbrake circuit over a basic resistive circuit.  I don't need anything fancy, I would even be fine with just a fixed attenuation that I can switch on/off.  Any thoughts?

Thanks for any help!