What synths do your rarely use but won’t part with?

Keen to hear about those synths that happily sit on a shelf or in a closet, rarely hooked up to your rig, but the thought of flipping it on is tantamount to blasphemy.

Mine is a Norand Mono Mk1. I feel that one day I can do great things with it, but that day is yet to come lol. What’s yours?