Yup - it'll work just fine. I've been doing this for the past few years with a Boss TU-2 or Boss GEB-7 pedal, and more recently with the Boss LS-2 to mix two pickups. Sometimes the lower impedance of 1Mohm actually works better than a higher one. I was previously using a Fishman Dual Parametric DI as an impedance buffer but it's 10Mohm input just let in far too much low end that I ended up using the parametric eq to take out all the low end. Hooked things up back to front one day, with the Boss TU-2 first, and it instantly sounded better - like putting it through a high pass filter. But yeah, as mentioned -try it and if it sounds good then it works!!!