I've used the split n' blend circuit here on Tagboardeffects and it's great. However, I've tried it with a Keeley 4-knob comp and they don't get along at all so I looked for alternatives and found this little circuit that I did a layout from. I haven't tested it yet but will do tomorrow.
Oh yes it does work fine! However, don't use it with a Ross Compressor circuit (dynacomp, Keeley 4-knob) because that won't work. I've asked Mark to do a layout for a blend circuit that works with compressors.
also, just a suggestion i don't now how if this will happen with this circuit, but the transistor choice for the split n' blend is very important. i used 2n5457's and i had major volume drop approaching and directly in the center, but once they were changed to 2n5458's it works like a charm. so if you notice that there's a volume drop with the sweep try different transistors.