Ok, My approach to Vocals has been a little different than the terror EBM sort of pitched intervals, and here it goes...
First off, I use a combination of in the box and HW fx to do this, although one could easily replicate the process with software alone.
I tend to have parallel tracks, sometimes i'll overdub to create some difference, other times i'll copy paste just so the content is there.
My "dry" channel gets EQ and compression, the eq more or less cuts the "honky" shit out of my voice around 250-300hz and boosts the top end for more clarity and presence. The compressor is in there to control dynamics and to boost the over-all volume of the channel.
The 2nd channel gets the same compression ratio and threshold, but feeds a Vocoder with a carrier signal that is only white noise. Based on the tune/effect I am looking for i mix it in to taste.
These 2 channels get subgrouped together and fed out of the box to a rack FX unit, Ensoniq DP4 where i have a stereo pitch shifter. The left side gets shifted in one direction (im not talking semitones, i mean cents, more like synth unison than massive shifts) and the right side the other direction. This can go from subtle to wide depending on the effect i am going for. The shifted signal is pretty wet in the chain.
The DP4 can do 4 parallel effects at once, or serial or a combination of the two - its very routable and configurable.
That said, I take another instance of the subgroup (not going through the microshifting) and pitch shift it down an octave. It's usually in there about 10-20%. I dont like it to sound super darth vader so i like it subtle in there.
The whole chain in summed in the DP4 and gets a tempo synced stereo delay followed by a reverb (that comes from Ableton).
An example of this FX chain can be heard in the link below, another big part of the sound is how the vocals have been "performed" its not the FX alone.
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(private link as this isn't yet released)