To say that using the FX8 any other way than intended is improper is in essence saying that it is wrong. If it will in any way harm the FX8 or the amp, by all means we should tell them not to do it and explain why. If it's going to have a detrimental impact on their tone or the way effects respond, we should give them that information and allow them to make the decision. If it works for them that's all that matters, if it sounds good to them it is good.
well in this case, there is a possible detrimental impact as i mentioned, when using the Post Output to the instrument input of the amp.
i agree that there are many critics, and forums and the internet in general tends to lean toward the negative in discussions, rather than the positive.
but i feel that definitely didn't happen here. as even you mentioned, i was the one who popularized this "improper" use, and i still do it today. so i can't see how i could have made it seem like someone absolutely shouldn't do it. it is a fact that it wasn't the intended method from a technical standpoint due to possible degradation of quality or mismatched i/o levels.
that is why the OP didn't find it in the manual. that's why i said what i did. and after that, i said for convenience you can use the jumper cable. but it still stands - as a fact - that it isn't the proper way to use the FX8.
if you want to tie the word "improper" to "judged for doing something wrong," then that's something you are doing. but that's about as plain-language as i can make it. but there is no judgment in my statement. it's not the proper way to use it, but feel free to continue to use it that way because it works. heck, much of the music gear we enjoy today came from improper use of things!
there CAN be wrong ways to do things though, even if another solution seems to work. and yes, i try to provide all the information so people can make their own decisions. but i definitely did not say anyone was "wrong" at all. you can choose to use the FX8 "improperly" if you want.
that said, you can still set all your blocks - including delay and reverb - to PRE, and use the Out 1 Pre Volume placement of the global volume pedal to let your delays ring out. you don't need to use POST settings and the jumper for that. Pre was made to go to the front of the amp, Post was made for the effects loop or other line level usage. that's all i'm saying.
this sort of critique of how people are choosing to help others here is what drove me away from the forum. spending so much time helping others - with ZERO return whatsoever - and people sit there and judge and critique what i said, and how i should have said it. how depressing. i don't know why i keep coming back.