> Almost all equipment with TRS jacks is made with the expectation that
someone will stick a regular TS plug into it at some time or another.
But one notable exception to this rule is Digidesign, although there are
others.
Digi hardware did [and may still do] have the ring connection tied to an
active op-amp output. Short that out and the op-amp will probably
survive, but the current consumption will go up and the little guy will
get hot.
However, Digi and most other manufacturers provide all the information
you need in the relevant User Guide. The one thing to remember that
there is no standard.
Tony
www.oakleysound.com