I surely will; first of all, I'm giving up on designing an over-the-top power supply, and will stick with using an ATX power supply, which already has +/- 12 V for the amps, and +5/+3.3 V for the rest of the board. Second, I will stick with the datasheets' input and output filter circuits, which are obviously tested to be within the converters' specs. I know that sticking with those filters will limit me to balanced only line input, and balanced/unbalanced line output, with no analog "volume" control for either part. And of course the input will not accept a guitar; but still, if the whole thing works as it should, then the problem reduces to adding a guitar/unbalanced frontend for the input filter, and an attenuation frontend to the output filter.