Parallel effects loop mixer - will this work?

[VPIF]

Hi.

Please reference the crappy MS-paint image below.

I want to build a paralell loop mixer.

On the left is an unrelated buffered ( http://tagboardeffects.blogspot.no/2012/02/cornish-buffer.html ) and non buffered input, with a single output jack + a tuner out jack on the back of the unit. Any suggested improvements for this section?

The rest of the unit consists of:
-2 x (1 x stereo) Fx inputs, that will recieve the signal from my (two separate) amps effects loops "send".
-8 x (4 x stereo) buffered paralell effects loops with a separate volume control for each loop.
-2 x (1 x stereo) outputs that will be connected to the (two separate) amps effects loops "return.

-Are there too many buffers in this design (with regards to noise, and so forth)?
-Can I use the the same buffer (see link above) throughout the circuit, or should I choose another type for the effect loop-level signal?
-As the more observant of you might have noticed, I didn't draw the effects return wiering, but they connect straight to the volume pots, right?
-What kind of pots should I use? (log/lin, 25K/100K/250K/???K).
-Do I need a phase switch? (In case I do: How and where).
-Anything else? (Yes, I will put some DC-current in there, even though it's not in the drawing)

As of now, a Boss RT-20, a Korg SDD-1000, a TC-electronic D-two and possibly a Roland SRE-555 (tape echo) will be connected to the loops (I understand that this might be relevant to the phase-switch question).

The FX input jacks will of course be connected to the effects loop buffers, as well as the buffer for the direct signal... Forgot to draw it.

Any help will be greatly appreciated

http://www.aronnelson.com/gallery/main.php/v/diyuser/Parallell+fx-mixer.jpg.html