I'm glad B was K-Stereo, it was my favourite. It may be different from usual stereo enchanters

but I think K-Stereo does better the jobs I'd use enchancers now.
I didn't like A so much, probably it's less sensitive than the others (maybe 125% would do the job?).
I didn't get much out of the third example anyway, so can't tell my opinion about Sonalksis yet...