Inverting buffer with lowest parts count possible

[seten]

I built a flying pan clone and added a split n blend on the left channel and a mini jfet blend on the right
http://tagboardeffects.blogspot.com/2012/02/split-n-blend.html?m=1
http://tagboardeffects.blogspot.com/2012/01/mini-blend-jfet.html?m=1

...but since the flying pan outs are inverting theres a volume drop in the middle of the blend. running out of real estate so Trying to figure out the smallest way to add an inverting buffer after the return and before the blend pot on both circuits. Figure i could use a tl072 and standard inverting buffer circuit (https://i.stack.imgur.com/QAzjH.png)  but i wanted to check on three things.
1. does it matter what value resistors to use as long as theyre the same?
2. do i need input/output coupling caps?
3. do i need to/should i bias the inputs of the tl072 to 4.5v?

[seten]

http://www.muzique.com/images/buff10.gif
guessing this is my best bet (assuming i need input and output caps) minus the optional 5pf cap.

I think i understand why they are biasing the non-inverting input - biasing the signal input/inverting input and grounding the noninverting input is what i would have thought, but then grounding the noninverting input would make the inverting input a virtual ground correct? okay, so then how come in this one https://i.stack.imgur.com/QAzjH.png they are grounding the noninverting input?

[PRR]

> so then how come

Different power supply scheme.

You do a dance. Up and down. If you start from a hole in the floor between basement and ground level, you start from ground. If you don't have any "down", you had better start from half-way up in a room, so you can swing both ways.

[seten]

> so then how come

Different power supply scheme.

You do a dance. Up and down. If you start from a hole in the floor between basement and ground level, you start from ground. If you don't have any "down", you had better start from half-way up in a room, so you can swing both ways.

gotcha - this helped me too i got it now.

https://youtu.be/pxKLeIjzxAk

[R.G.]

Why not put one inverter at the front of the thing and invert the input to the Flying Pan? The original input is then in phase at both blends because the FP re-inverted.

[Sooner Boomer]

Why not go "old school" and use an emitter-follower single transistor buffer? Input cap, three resistors, and an xstr. Minimal real estate.

[seten]

 I already built it with a dual Tl072 inverter  and theres something up with my blends which I was able to isolate to the blends themselves. Both great ideas though which I'll implement once I figure out my problem - I made another thread since it seemed like a different topic.
https://www.diystompboxes.com/smfforum/index.php?topic=125597.0

[Steben]

Why not go "old school" and use an emitter-follower single transistor buffer? Input cap, three resistors, and an xstr. Minimal real estate.

It's not quite .... inverting