My current rig, looking to swap the Sub 'n' Up with a Boss PS-6, the ODB-3 with a Source Audio Aftershock, and fill the open space with an MXR Bass Envelope Filter :
MXR M82 Bass Envelope Filter Pedal | Sweetwater
Boss AW-3 Wah And Envelope Filter Pedal With Tempo Control | Full Compass Systems
NPD-MXR Bass Envelope Filter. Not the most exciting but I love the sound of this pedal. : r/guitarpedals
MXR M 82 Bass Envelope Filter – Thomann United States
Source Audio Soundblox Pro Bass Envelope Filter - Tonebox.com
DOD FX25B Envelope Filter Pedal | Reverb
BASS FILTER SHOOTOUT // Boss AW-3 vs. MXR Bass Envelope Filter vs. EHX Q-Tron - YouTube