I was in a guys studio the other week and he had the realtime spectrum analyzer from his RME interface running permananetly on a second monitor. It's part of the driver and runs independantly of asio hosts ect. This is great for cross refernecing against mp3s ect and having to insert a vst plugin on the master and every time and work a way to get it visible permanently just isn't the same. Also, this one could almost fill the whoile screen. I've even heard of people running a whole spare PC just for this..... A KX Dsp plugins would be much neater. I'm not sure how they work. I'd make a guess and say some sort of FFT and I know this has been said to be inpractical to do in DSP in most cases, but considering it just has to break the frequency bands up and display them, could it be done? Obvisuly, sound quality isn't an issue and there's no processing or recombining of the bands to deal with. As far as resources, I'd be happy if the DSP was devoted to one really useful thing, considering everything else is better in vst plugin form these days anyway.