Starlight Xpress 5-Position SXMDFW-2T MIDI USB Filter Wheel for 2" Filters with Male and Female T-Threads and a Slimline Off-Axis Guider OAG | High Point Scientific
MIDI Thru 4 / Filter - Miditech
midi note filter: toggle individual notes, rather than range - Cockos Incorporated Forums
Miditech Midi Thru 4 /Filter – Thomann United States