Boss GA-FC EX Jalkakytkin

Boss GA-FC EX Foot Controller — Expanded Hands-Free Control for BOSS Katana Amps

The Boss GA-FC EX is a six-switch floor controller built for players who want full command of their BOSS amplifier without bending down to the top panel. Designed as the upgraded successor to the standard GA-FC, the GA-FC EX adds bi-color status LEDs, a dedicated mode jack, and three new operating modes that turn a compatible Katana into a true amp-plus-multi-effects rig at the player's feet. The Boss GA-FC EX is the right choice for guitarists running a BOSS Katana Gen 3 or MkII amp who need instant, hands-free access to channels, effects, banks, and expression control during live performance.

What Sets the GA-FC EX Apart

Where the original GA-FC used single-color LEDs that left players guessing which mode they were in, the GA-FC EX uses two-color LEDs — red for channel/bank switching and green for effects switching — so the current state is visible at a glance under stage lighting. A dedicated MODE jack with a three-way selector adds three new operating modes that the standard GA-FC simply cannot offer: EXP PEDAL 3 for a third expression pedal, FOOT CONTROL 2 for running two amps from one controller, and EXPAND for chaining a second GA-FC or GA-FC EX for double the footswitches.

Switching Architecture — Channel, Bank, and Effects at Your Feet

The switching layout is built around six heavy-duty footswitches arranged for fast access during a song, with a long-press panel button that flips between Bank A and Bank B for eight total preset slots. A dedicated function switch toggles between three operating layers — channel select, effect on/off, and solo/loop/tap-tempo — so every parameter on the amp is reachable without diving into menus.

• Footswitches: 6 heavy-duty switches — channel, bank, panel, function, and effect toggles in one row.
• Status LEDs: Two-color (red/green) — instantly shows whether the unit is in channel mode or effects mode.
• Bank access: Bank A and Bank B via panel long-press — eight presets reachable without menus.

Expression Pedal and Mode Jack — Real-Time Parameter Control

The rear panel hosts the connectivity that makes the GA-FC EX a true performance controller rather than a simple preset switcher. Two dedicated 1/4-inch TRS expression pedal jacks handle volume, wah, or any assignable parameter, while the MODE jack with its three-way selector unlocks the unit's headline features.

• Expression pedal jacks: 2 × 1/4-inch TRS — supports FV-500L, FV-500H, and Roland EV-5 for wah, volume, or effect depth.
• Mode jack: 1/4-inch TRS with 3-way selector — switches between EXP PEDAL 3, FOOT CONTROL 2, and EXPAND modes.
• EXP PEDAL 3 mode: Third expression pedal support — adds a third assignable pedal beyond the standard two.
• FOOT CONTROL 2 mode: Dual-amp control — operate two BOSS Katana amps simultaneously or independently from one controller.
• EXPAND mode: Chain a second GA-FC or GA-FC EX — doubles the footswitch count for full memory and effect access.

Build, Connectivity, and Compatibility

The chassis is built for the road, with a rugged metal housing that survives daily gigging, and the unit draws all needed power through the included TRS cable — no external power supply or wall wart is required. Compatibility spans the full current BOSS amp lineup plus select Roland products, with full feature support on most Katana Gen 3 and MkII models.

• Dimensions: 392 × 81 × 49 mm (W × D × H) — wide enough for stable floor placement, slim enough for pedalboard layouts.
• Weight: 1.0 kg — light enough to reposition mid-set, heavy enough to stay put underfoot.
• Connection: Single 1/4-inch TRS cable (included) — no power supply needed; plug-and-play with the amp's GA-FC jack.
• Full-feature compatibility: All Katana Gen 3 except Katana-50 Gen 3; all Katana MkII except Katana-50 MkII — plus standard GA-FC functionality on Katana-100/212/Head/Artist, Nextone series, Waza Tube Amp Expander, Katana Bass amps, Acoustic Singer Pro/Live, Gigcaster 8/5, SDE-3000EVH/D, and Roland Blues Cube Artist/Artist 212/Tour.
• Optional accessories: FV-500L, FV-500H, EV-5 expression pedals; FS-5U footswitch — expand the rig without replacing the controller.