I’m looking for something to compress midi velocity, to get pitch-to-midi guitar velocity values to match the velocity curves of a compressed/distorted guitar, rather than the velocity curve of a ‘clean’ guitar sound, which seems to be the default for pitch-to-midi systems I’ve used to date.
It’s not a compressor per-se, but you can use the Limiter pipe to clip/scale notes into a velocity range of your definition. I use this to compensate for my caveman finesse on keyboard dynamics 
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So you’re interested in something like the ‘Equalizer’ pipe, but acting on velocity only? (Equalizer changes velocity based on the note number)