This thread has been most informative, went through all 144 pages and I can tell you sometimes it makes my head spin. That argument on shorting the 22uF coupling caps vs bypassing them especially.
I've got a question for bichu/germanium or anyone else that can shed some light into it :
Based on general opinion, electrolytic caps are bad for coupling in the direct signal path. Assuming there is a DC offset and one rules in favour against shorting/forming a wire bridge, would a straight forward replacement of those 22uF electrolytic caps with a polyester or polypropylene (values between 0.47uF - 1.5uF) work?
If you are *REALLY* afraid of the DC bias, here's something you can do.
Short the onboard coupling caps, yes I know what you are thinking, but there's more.
Pick a external enclosure of your liking that is capable of housing the number of capacitor that you need. (1 pair or 4 pairs, whichever you prefer)
Wire the output of your sound card to the box and hook up the capacitor as follows:
Input -> 100K Resistor to ground
Input -> 1uF Capacitor -> Cap output
Cap output -> 100K Resistor to ground
Cap output -> Output connector on the box.
Yay~~~ You got yourself an external capacitor coupling box... I haven't really calculate the low frequency dropoff point, but IIRC it should be quite low.
You should wire some sort of cable to hook onto your sound card's standard output connector, instead of directly onto the PCB. Just for the sake of safety and reliability.
The cap coupling box is also useful in cases where you are uncertain if there are going to to be DC bias in the output. This can be a useful "insurance" if you are modding and unsure if it will blow up in your face after 10 minutes of run-ins. :P