Custom Blender Idea - Help me think this through

I'm considering ordering a custom blender and I'm thinking through signal routing ideas. I'm hopping some of the TB Effects gang can help me think this through before I finalize my plans.

I want a unit primarily for blending clean signal with dirt pedals (I don't use many other effects). I'm inspired by a few things I've seen in the wild, mainly the Iron Ether Divaricator, Brimstone Ouroboros and the CoG clean blends on their dirt pedals. My goal is to be able to blend clean and dirty signals, but primarily the low end of the clean tones with the the dirt. I also plan on going direct into a DAW, so I want a LPF to limit the nasty high end content that passes through. I know I can play with EQ and pass filters in the box, which I will probably do to "prototype" things, but I do want to have a pedal format and an analog physical knob to make adjustments.

My current idea is as follows:

Clean signal in from bass (possibly dry, possibly after a Noble pre) then split into two paths.
1 - Clean channel with a LPF, so I can blend in a clean sound, but but with the option to limit it to the low end of the frequency spectrum, similar to a CoG clean blend. I'm not sure this needs to go out into an external loop for other pedals. I could run an effect through here or put the Noble pre here.
2 - External loop for dirt. I'd like to have a gain and HPF before the effect, so I can control the level that hits the effect/dirt as well as the low end content. I'm funny about this, but I do like to hit dirt pedals with a softer signal. Then I'd like a LPF after the return, so I can roll off the nasty highs from full-range high-gain distortion. I'm not sure if this LPF should be channel specific or on the blended signal.

Obviously some sort of level/blend control will be needed to bring the signals back together into a mono signal out.

I'm also unsure about using a HPF and LPF vs. a crossover. My concern is that I could chunk out a valley of mids or overly overlap them, trying to blend the pass filters, whereas the crossover would handle that for me. However, I may want to be able to blend in a full range clean tone.

From what I've read of the @Azure Skies HPF/LPF and custom work, I'm going to ask him to do the build. He's given me a "ball park" quote for price and build time that I like, but obviously bells and whistles will move those needles.

What say you, TB? What am I forgetting or over engineering?

Edit to include desirable suggestions and considerations:
1 - Phase switch - add one!
2 - How many foot switches and what do they control?
3 - Power - 9v in converted internally to 18v is always nice, and mA draw supportable by the Noble.

Sketched idea...



7/19/17 Update:
...Update (for the few who care).

Now that I have a DSM OmniCab Sim, I'm revisiting this idea. I think that the LPF function I wanted is now going to be handled by the OCS. I'm now considering just testing out a Divaricator to handle blend function. IE offers a 5 day test period, which is certainly comforting vs. ordering a custom pedal I'm not 100% set on.

 

Good call!

 

I hear you on the dedicated cab sim box, but word round the campfire is that the Broughton LPF is pretty good at that.

I've been meditating on the switching. How many and what gets controlled. I'm going to mainly use it as an on/off box, like the Divaricator. But options can be useful.

 

That's not too bad. I've already mentioned it to Azure Skies, so I'd like to stick with him, particularly since he's on my side of the pond

 

I'm thinking along those lines. Though the outside thought of a band pass on the clean came to mind for keeping clean attack from the highs. But that's starting to feel overly fiddly.

 

Pedal graphic found

 

I'd considered that at one point. Probably a reasonable reason to have a "clean" loop.