In the documentation of the SoundTouch Library - which is here: https://wiki.audacityteam.org/wiki/SoundTouch - could we add a little note at the end of the third paragraph? Anything along these lines would be fine:
Note: While the SBSMS algorithm will preserve the overall loudness of the original track, please note that peak levels of some waveforms may be substantially higher.
I think that if we did that, then by the same rationale there would need to be similar warning for all other effects that may cause the peak level to change (which is most of them).
Thanks again Peter. I realize (as Steve implied earlier) that putting the warning in the Wiki is sort of a “slippery slope”, since most effects can have unanticipated side effects. But - at least for this end user - that is the best place, since it is easily overlooked in the Effects & Analyzers menu pages.