Bastl Instruments Kastle 2 FX Wizard

The Kastle 2 FX Wizard is a compact, patchable stereo multi-effects unit from Bastl Instruments. It is a digital box: stereo audio processing runs at 44kHz and 16 bits, and the signal path is re-routable through an assortment of mini patch points across the faceplate¹. MusicRadar described it at launch as "a stereo digital multi-effect unit that is re-routable via an assortment of mini patch points"².

The Bastl Instruments Kastle 2 FX Wizard is a compact effects unit whose DELAY FX family (blue/green) includes a clean stereo delay, a flanger with stereo chorus capabilities and some spicy extremes, and a freezer to capture and hold moments of time¹. It draws approximately 100 to 150 mA¹.

The controls and patch points

The FX Wizard carries nine effect modes, selected from the panel or driven from outside¹:

Bastl groups the modes into families. The delay family (marked blue/green on the panel) includes the clean stereo delay, the flanger with stereo chorus capabilities, and the freezer for capturing and holding moments of time¹. MusicRadar noted that "the Pitch-Shifting FX family has pitcher, replayer and shifter modes"².

The patching is where the unit departs from a conventional multi-effects pedal. Modes can be changed under voltage control: there is an FX MODE CV input with an attenuation control, so an external CV source can step through the nine modes¹. The Time parameter has attenuverting modulation, selectable between sample-and-hold and free operation, which shapes how the core timing of the current effect responds to a control voltage¹.

MusicRadar framed the result as a creative partner rather than a stompbox: "Bastl's pocket synth gets reimagined as a modulation-focused stereo effects processor"².

The FX Wizard's controls center on a Time parameter with attenuverting modulation, selectable between sample-and-hold and free modes¹. The delay family covers a clean stereo delay, a flanger with stereo chorus capabilities, and a freezer that captures and holds moments of time¹.

Power and connections

Power comes from two routes. The unit runs on three AA batteries, rechargeable or non-rechargeable, with a quoted battery life of up to 15 to 18 hours¹³. Alternatively it powers over USB-C, the same connection used for firmware updates and USB MIDI¹. Power consumption is approximately 100 to 150 mA¹.

Audio connections are stereo mini jacks for input and output, alongside analog sync in and out, so the unit integrates with other gear without a shared clock box². The stereo output is capable of driving headphones up to 250 Ohm, so headphones can be plugged in directly¹.

MIDI over USB is bidirectional. From firmware version 1.3 onward, the FX Wizard both sends and receives USB MIDI¹:

• USB MIDI input: clock, notes and CCs¹
• USB MIDI output: acts as a MIDI controller, sending clock and CCs¹

Bastl says this makes studio integration straightforward, and the unit ships with open-source firmware and schematics¹.

How it differs from the Wave Bard

The Kastle 2 line includes a second instrument, the Kastle 2 Wave Bard, a compact, patchable and experimental groovebox that fits in your pocket⁴. The two share the platform: both run on 3 AA batteries or USB-C, both have a stereo output capable of driving headphones up to 250 Ohm, and both send and receive USB MIDI (the Wave Bard from firmware version 1.1 onward)⁴.

The difference is the engine. The Wave Bard is a synthesizer with stereo delay or chorus/flanger effects built in, plus a tempo-synced pattern generator with GATE and CV output that is patch-programmable, and six factory-loaded banks, up to 32 banks in the editor⁴. The FX Wizard is the effects-focused sibling: it processes external stereo audio through its nine modes rather than generating its own patterns, and its patch points route and modulate the effect processing itself¹².

For a guitarist, the FX Wizard sits closer to a delay, flanger or pitch-shifting pedal in function, but with CV patching, sync and battery power in a pocket-sized enclosure instead of footswitches and a pedalboard power supply¹².

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