You see 'varispeed' is one of those loose terms (similar to gapless audio) that means different things to different people. To some it means pitch shifting, to others time stretching to me it is the ability to alter tempo (speed) while retaining every other aspect as intended (as well as being able to alter pitch if necessary) and in real time.
Read it again SToons as I swear it's you that's not paying attention.
What Mike is talking about is shifting the pitch of the mix to suit an out of tune Dulcimer.
He's then saying that it's the lack of 'Varispeed' is causing him difficulty. He's now been offered the idea of zPlane, some freeware, and Audition's pitch shifting capabilities as well as using a detuned midi guide to track to. The lack of 'Varispeed' doesn't seem to be the issue at all.
Tape style varispeed is simply altering the pitch as a product of changing the speed (tempo). So varispeed implies at least changing, being able to vary the speed, preserving the pitch or changing the pitch are the options available these days.
Pitch shifting here alters the pitch whilst keep the tempo intact, Mike is talking about pitch shifting here and using it to complain that Sonar doesn't have 'varispeed'.
All he really needed do is ask how best to go about solving his problem, many of us do it daily without fuss or complaining that the software we bought is not up to snuff.
btw I can't think of anyone that would want to speed up an audio passage by 70 bpm either but there you go it's possible.
Also I'd like varispeed in Sonar too but not to tune an out of tune dulcimer, or conversly detuning a mix to suit it, I'd use pitch shifting for that.