I'm coming at this with overdrive in mind but it could apply to other effects too. With an overdrive should you be effecting the whole signal? This would make the balance control on the ODB3 obsolete. Surely the whole idea of overdrive is to drive, but by keeping in much of the original signal the drive would be very weak. Many other overdrives pedals, Big Muff, Nobels ODR-B and Ibanez PD7 to mention just 3 don't mix clean and dirty signals but maybe they have the right idea, they drive the whole signal If you drive an amp you drive all of it, not just some of the signal.