Boss SY-300 Guitar Synthesizer Pedal - Box Opened

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£539.00 RRP £595.00 (including VAT @ 20%)

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1 year warranty and 30 day money back guarantee included

1 year warranty and 30 day money back guarantee included

Once the product is delivered, you have 30 days to decide that you definitely want to keep it. If you decide it is not suitable for any reason, you can return it back to us for replacement or full refund, including standard delivery charges.

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Product Ref: 82598

  • Turn Any Guitar Into an Analog Style Synth!
  • 3 Assignable Pedals, 1 On/Off Pedal
  • 4 Dedicated Effects Processors
  • 70 On Board Presets / 99 User Presets
  • USB Audio Interface / Midi Connectivity

Boss SY-300 Guitar Synthesizer Pedal - Box Opened

The Boss SY-300 Guitar Synthesizer is a compact electric guitar and bass pedal which allows you to turn your guitar into an Analog style synth with just a standard 1.4 inch jack cable. Featuring a large array of on board controls such as filters, LFOs, pitch controls and wave shapes the SY-300 provides all the tools to create true analog style synth tones whilst the versatile connections make it perfect for live use. Also including a built in USB audio interface the SY-300 can be used in the studio to re-amp guitar tracks or download new synth patches from the Boss tone central website.

Please note, the box has been opened as part of our quality control inspections and as such all the seals have been broken. The item itself is brand new and has never been used.

This is a great opportunity to buy a fully functioning product at a discounted price, supplied with a one year warranty.

Product Ref: 82598

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Buy on finance from £14.85 per month Finance from £14.85 per month  

  • 15.9%
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  • £677.16
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To make it as easy as possible for you to get the gear you want, we offer a range of instant finance options. If you spend £250 or more online, you can choose to pay over 48, 36 or 24 months. The majority of decisions are given instantly, so you could get your new gear sooner than you thought!

Representative Example

To help you understand how our finance options work, the examples below are based on a total order value of £250:

Finance APR Deposit to Pay Payments Total Payable
Classic Credit 48 Months 14.9% 14.9% No Deposit 48 months: £6.83
Final payment: £6.83
No settlement fee
Classic Credit 36 Months 15.9% 15.9% No Deposit 36 months: £8.65
Final payment: £8.65
No settlement fee
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Please note: This is only available on orders placed via the website and is not available in store or via phone currently.

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Plug In and Play

Unlike other synth pedals the SY-300 can be used with any guitar via a standard 1/4-inch cable and does not require a special GK pickup or 13-pin cable. Powered by an ultra-fast DSP and newly developed innovations from Boss, the SY-300 performs it's amazing guitar to synth transformation in real time, with no lag whatsoever. This delivers a latency-free playing experience that's a natural extension of your normal guitar, letting you to play freely and organically without altering your technique in any way.

Analog Style Synth

The SY-300 incorporates a polyphonic synth engine with three individual sections to provide a range of fresh and exciting tones like never before. With a variety of synth parameters such as wave shapes, filters, amps, pitch control and LFOs you can create any sound you desire whilst the built in step sequencer with tap tempo allows arpeggios and dynamic melody creation. Additionally they is also a blender function which allows mix and matching between different patches to create your dream tones.

Four Powerful Effects Engines

Effects play a huge role in synthesizer sound design, and the SY-300 is filled with options to take your tones into the stratosphere. Four simultaneous effects engines are available, each packing a number of effects types including overdrives and distortions, Slow Gear, Isolator, Slicer, and many others. Some types can even perform two effects at once, such as chorus and delay or delay and reverb.

Assignable Controls & Versatile Connectivity

Controlling the SY-300 while performing is simple. Using the four built-in footswitches, you can bypass the synth sound, scroll through patches, and control three different parameters of your choosing per patch. Two external footswitches or an expression pedal can also be connected for even more real-time control if needed. The Thru output lets you to send your dry guitar sound directly to your pedals or amp, or it can be used along with the Return jack as an effects loop. Dual output pairs (Main and Sub) offer assignable signal routing options to integrate with any setup, while MIDI In and Out/Thru jacks are provided for interfacing with switchers, drum machines, and other MIDI gear.

USB Audio Interface

The Boss SY-300 is loaded with a USB audio interface to record audio tracks directly into your digital audio workstation or chosen recording software. Whether you want to capture your fully modulated tone or just the dry signal the SY-300 can do it all. Furthermore you can also send signals from within your DAW through the SY-300 to add the raw synth power to a variety of audio types. The SY-300's USB connection also allows you to build and organize patches with the dedicated BOSS Tone Studio editor and download new patches from the BOSS Tone Central website.


  • Play rich and expressive polyphonic synth tones with any guitar
  • Completely latency-free playing feel directly connects your hands with the sound
  • Three simultaneous synth sections and four effects processors enable rich, dynamic, and diverse sound creation
  • Shape your normal guitar tone with synth filters, amplifiers, and LFOs to create all-new sounds
  • Graphic LCD display, three assignable footswitches, and dedicated on/off footswitch
  • 70 ready-to-play preset patches and 99 user patches for storing custom sounds
  • Create and archive sounds on your computer with the BOSS Tone Studio editor/librarian
  • Download new sounds at BOSS Tone Central
  • Works with bass and other electronic instruments as well


  • Inputs: 1 x 1/4" Jack
  • Outputs: 2 x 1/4" Jack (Main Output), 2 x 1/4" Jack (Sub Output)
  • Additional Connections: 1 x 1/4" Thru, 1 x 1/4" Return, 1 x MIDI In/Out, 1 x 1/4" EXP CTL, 1 x USB
  • USB: USB (Type B)
  • Pedals: 1 x On/Off, 3 x Assignable
  • Knobs: 6 x Rotary
  • Buttons: 7
  • Screen: LCD
  • Presets: 70
  • User Patches: 99