Hello everyone, my first post here on SS guitar!

I would like some opinions about a thing I'm trying to do.
I have a big tube amp (rack), but it's quite bulky.
Using it every time I have an idea and would like to record it... well, too unpractical

(takes too much time to plug everything, to warm up tubes, to set the microphone etc.)
I decided that for these quick ideas a "direct" recording would be the way to go (guitar into pc + some amp simulation software)
Since my soundcard does not have a high impedance input, I have to make one

(input on soundcard is unbalanced line-level)
So, here is the idea: I would like a high impedance input + some voltage gain. Since I like the sound of the
"Fetzer Valve", this part is covered. I would also like a low impedance output, so I need a
buffer.
I did these schematics in DIY Layout Creator, so you can see exactly what I'm doing:

Then, my idea was to simply join them together like this:

And now: the questions:
1. Would this work? (why / why not)
2. How can I improve this circuit? I've got Fetzer valve figured out, but I have no experience/understanding of buffers.
3. Do I really need the in/out capacitors in the buffer? How to they work (what do they do)?
4. Do I really need the 1M gate-source resistor in the buffer? Does it add any noise?
5. I like the 2N5457 in the fetzer valve, but would the MPF102 be better for the buffer?
Looking forward for your help... and thank you in advance
