Boss SY-300 Advanced Guitar Synth Pedal

The Boss SY-300 unlocks synth power for guitarists without the need for special pickups or cables. Plug in any standard 1/4-inch instrument and access a zero-latency polyphonic synth engine designed to track your playing with total accuracy. Three fully independent oscillators power the core of the sound design system, each offering a range of selectable waveforms including sine, triangle, saw, square, pulse-width modulation, detuned saw, noise, and even an input waveform to blend your dry tone directly into the synth structure.

Each oscillator can be shaped with standard analog-style parameters—filter cutoff and resonance, amplitude envelope, and pitch tuning—as well as LFO modulation, making complex layered patches easily attainable. Add movement and articulation via the step sequencer or use the Blender function to fuse parameters from different presets into new creations on the fly. Whether designing pads, leads, rhythmic pulses, or chaotic textures, the synth engine responds dynamically to your playing without compromising technique or timing.

Four simultaneous effect blocks provide expansive tone-shaping control with over 20 selectable types. Options include classics like phaser, flanger, and tremolo, along with layered effect combinations such as chorus plus delay, or delay plus reverb. More experimental entries like slicer, lo-fi, isolator, and slow gear push the SY-300 beyond traditional pedalboard boundaries. Each effect engine can process synth voices, dry guitar, or both, allowing full customization of routing and tone.

Additional performance tools include assignable footswitches, external control via MIDI or expression pedals, stereo I/O with dry signal pass-through, and a USB interface for audio recording, patch editing, and patch sharing through Boss Tone Studio.