This probably sounds silly but there’s lots of my favorite music which I find can sound more enjoyable when using a pitch or varispeed control to reduce the tempo to between 3 and 7%; sometime as much as ~ 9%-even though the pitch is not preserved.
Circa 2010, someone gifted me Samplitude PRO X, though which I only used for applying real time pitch down shifting when playing my rips of CD tracks. But that was on an old Windows XP desktop and I would need to have it on my Windows 10 HP ZBook. I still have the Pro X product key to download it but don’t want to risk that old version not working and then having to uninstall it and thereby losing that big block of non-rewritable storage space on my system SSD drive.
Samplitude is notorious for its steep learning curve but at least I was able to find and use the real time pitch control knob from its transport control interface easily enough.
Having used Pro X forever, it’s tempting to go back and get the new version, assuming the varispeed's easily accessible. Samplitude’s varispeed always sounded very transparent to me. But is that same sound quality shared among all versions of Sound Forge, such as https://www.magix.com/us/music-editing/sound-forge/sound-forge-audio-cleaning-lab/ ?
I doubt that most here would have much need for a tool like real time varispeed, especially since it's not intended to preserve pitch while changing the tempo.
But do both Samplitude and Sound Forge Audio Cleaning have a real time "tape deck like" varispeed slider in the transport window that has zero impact on sound quality?