Imagine a tiny powerhouse that fits in your pocket yet conjures full melodic worlds from monophonic roots, all thanks to clever patching and scale quantization. That's the magic of this hybrid synth, the latest evolution in Bastl's Kastle 2 series, blending raw experimentation with structured harmony.
At its core, four oscillators drive five distinct modes—Filter, FM, Supersaw, Hypersine, and Glitchnoise—spanning FM with feedback, raw waveform mixing, ring mod, track-and-hold, stereo noise, and a transient shaper, all filtered through a stereo filter. Hands-on knobs handle Pitch (spanning ±3 octaves), Timbre sweep refined by Ratio for detune and mixing, Pitch Mod and Timbre Mod attenuverters, plus LFO frequency and mod with triangle/pulse outputs that sync or run free. A dual FX section adds delay on one side and chorus/flanger/distortion on the other, processing stereo audio at 44kHz/16-bit; feed it stereo input (up to 6Vpp with +12dB gain) to mix or effect-ify external sounds. Patchable jacks include trigger, note/quantized pitch, play for arpeggio grids (3rds, 5ths, octaves), gate/CV/pattern generator outputs, sync in/out (doubling as modular I/O), and USB MIDI for clock/notes/CCs both ways. A web app customizes scales, rhythms, and sequencer steps, while tap tempo and clock divider keep it grooving—powered by 3 AA batteries or USB-C, it measures a pocketable 95x70x45mm and weighs just 132g, with 10 patch cables included.
Players love how it sparks endless ideas on the go, syncing effortlessly with other gear for jams that feel bigger than its size, though some note the learning curve for deep patching rewards the patient.
