Affordable Boss Katana Footswitch: Ultra Hack! - YouTube
Roland GA‑FC Foot Controller for Boss and Roland Amplifiers – Flipside Music
Boss Katana-50 MkII EX Guitar Amplifier 50w Combo COMPLETE STAGE BUNDLE | KraftMusic.com
Footswitch for BOSS Katana 50 MKII : r/BossKatana
Boss Katana 50 MKII 1x12 Combo with FS6 Footswitch at Gear4music
Amazon.com: XSONIC Airstep Kat Edition KATANA MkII & I Footswitch with 5 Footswitches, 2 Control Modes(Change Presets, Toggle Effects), 300H Playtime, Modify Amp sound with BTS App for iOS and Android, Wirelessly :
Boss Katana MK1, MK2 & Artist footswitch Preset Display and a 9Vdc Power Supply | eBay