While the Sub 37 Tribute is already an absolute powerhouse synth, a couple tweaks and upgrades from the masterminds at Moog certainly don't hurt. Produced in limited quantity at Moogfest 2017 with preloaded patches from Moog artists like SURVIVE and 808 State, the Moog Subsequent 37 CV Paraphonic Analog Synth delivers an upgrade sound engine, grittier multidrive, expanded headroom, and plenty more under the hood to keep any synth junkie turning knobs for days.