[chrisso]

I have a Serge Frequency Shifter.
If you mix some original audio alongside the Shifted audio you get some rich phasing effects.
If you input a melodic passage and shift the frequency so it almost mirrors the same pitch as the melody you get some ring modulator type effects, although cooler sounding.
I've also used it to literally retune drum samples. In that respect it isn't an accurate pitch shifter, but like a pitch shift with a weirder result.
Again, quite cool.