I have read in several places that if you want to connect a MIDI TRS-A connection to another TRS-A connection, then it's possible to use a standard/straight 3.5mm stereo audio cable.

However, this doesn't make sense to me because that would mean that the two "source" connections are connected together and the two "sink" connections are connected together. Surely, these need to be swapped over in the cable? I would expect a straight cable to work if connecting a TRS-A to a TRS-B but not TRS-A to TRS-A (or TRS-B to TRS-B).

TRS-A cables that I have seen for sale are also sometimes (often?) labelled as "also suitable for audio" which suggests it's a straight cable. I'm very confused.

There are countless wiring diagrams on the web describing how to wire a TRS plug to a DIN plug, but any information at all on TRS to TRS seems to be very thin on the ground

Can anyone enlighten me please?