I had the basis on one in a Tool (at least for 2.7, not tested with 2.8) but the setting are hard coded (eg fixed 8 voices), spread and adjustments are random and it was partly a proof of concept and hasn’t been updated in a long time.
BitArts did suggest an alternative method for more even spread and apparently more typical type unison sound.
One day I might try and do some more to my small collection of tools. Ordered a refurbished eeepc earlier, so maybe I can do little bits and bobs on the move and during the times the boss isn’t in at work (early mornings/late evenings/weekends.)