Hello, first of all, i hope all of you are safe and healthy

I want to take the speaker out from my amp into my sound card to apply a speaker sim in the computer (and record with it). i know that i have to run a paralel out to my real speaker to keep the correct load to the amp

I already have built a buffer and am going to build a di based on your schematic:
https://www.tube-town.net/cms/userfiles/media/di_and_line/di-box.jpg

do you think i also need to build this line out?
https://www.tube-town.net/cms/userfiles/media/di_and_line/line-out.jpg
or i could just build a line out like this:
https://www.gearslutz.com/board/attachments/so-many-guitars-so-little-time/367008d1381534439-how-hard-might-add-line-output-amp-doesnt-have-one-line-out.gif
and then go through the buffer and di I already have?

so, my question is: can i build a simple line out and safely connect it to a sound card? if it's needed i can run it like this: speaker out->line out box->buffer->di
or do i need to build that line out you propose with a transformer?

thank you

Hello,

I would always go for the balanced output version. Most simple is your first proposal. Option 3 is the most simple circuit to integrate in an excisting amp, but needs an additional loose DI box for safe interconnection to to your PC

Hi

Option 1 is ideal for Mixer Mic Inputs, Optinon 2 is the best option for Mixer Line-Inputs or for feeding additional Power Amps. And i  agree with kentuckytukker concerning balanced connections and therefore always would prefer using transformers for balancing.

Hello
Thank you for your replies, but I want to confirm if I understand your advices.

I already have built these:
-active buffer
-passive DI
-line out based on the gearslutz image (just added a pot to ground to control the volume)

I want to run the speaker out from the amp to my line out and then to pedals before going into the the pc interface, is it ok to go like this:
Amp->line out->pedals->passsive di
?
Should I use the active buffer before the pedals?

Should I change my line out build to something with a balanced out? How could I connect a balanced out to my guitar pedals, it wouldn't be possible...?