Mopho x4 is the newest addition to DSI's revered line of analog subtractive synthesizers. Building upon the same award winning voice architecture of the Mopho and Mopho Keyboard, the Mopho x4 boasts huge sound and 4 voice polyphony in an ideally sized, portable, and elegantly designed package. Use it to create huge unison basses, creamy leads, maniacal sequences, and ethereal pads.
4 times the voice 4 your pleasure

Each of Mopho x4's four voices is composed of two analog oscillators, two sub octave generators, selectable 2- or 4-pole famed Curtis low-pass filter, three 5-stage envelope generators, four LFOs, a re-latchable arpeggiator, and a 16 x 4 step sequencer. Its voice also comes packed with 20 modulation sources and almost 50 destinations!

FM the filter to create metallic bell-like sounds and use the feedback path to add subtle or destructive harmonic content to your sound. Mopho x4's 100% analog signal path is powerful, monstrous, and sonically dynamic!
Work less, play more

Mopho x4 is intuitive and inviting. Every parameter is fully programmable and editable from the front panel. The controls are logically laid out, lending themselves to quick access so you can tweak knobs without missing a beat.

The x4's full sized 44-note semi-weighted keyboard has aftertouch and velocity sensitivity. The sturdy full sized pitch and mod wheels are freely assignable and sport smooth reliable action.
It grows with you

Expand Mopho x4's polyphony using it's Poly Chain port. Mopho, Tetra, and Prophet '08 can all be connected to the x4 to increase its voice count. You can Poly Chain up to three Tetras with Mopho x4 to create a 16 voice analog super synth!
The Mopho x4!

Dave Smith Instruments is the only company pioneering and producing fully programmable polyphonic analog synthesizers. In fact Dave's been at it for 35 years!

Designed and manufactured in San Francisco, Mopho x4 has the high quality sound and build for which DSI is renowned. From its feature packed analog voices and unmatched sonic versatility to its refined design and engaging interface, you won't find a polyphonic analog synthesizer like this anywhere else. 

Features

• 100% analog signal path
• Two oscillators per voice capable of producing sawtooth, triangle, saw/triangle, and variable pulse width square waves, with hard sync
• Two sub-octave generators per voice (one octave below oscillator 1 and two octaves below oscillator 2)
• One classic Curtis low-pass filter per voice (switchable 2- or 4-pole) with audio rate modulation, self-oscillating in 4-pole mode
• Analog VCAs
• Three envelope generators per voice (ADSR plus delay)
• Feedback loop per voice with programmable level and gain
• White noise generator
• 4 LFOs per voice
• Gated 16 x 4 step sequencer per voice (one sequence per program)
• Arpeggiator
• Glide (portamento): separate rates per oscillator
• Full-sized, 44-note (F to C), semi-weighted keyboard action with velocity and aftertouch
• Full-sized modulation wheel and spring-loaded pitch wheel
• Fully programmable with four banks of 128 read-only factory programs and four banks of 128 user programs (1,024 total)

New Gear

We are authorized dealers for a number of great companies that back their products with standard warranties.

We extend this warranty period for 1 year beyond the manufacturer's as a token of our gratitude for shopping with us  :)

We want to make sure that you don't get stuck with a lemon and will either replace or have the unit repaired by an authorized service center on our dime.

We offer a 30 day return policy 'no questions asked'.

Unless the item is defective, you will be subject to a 15% restocking fee. 

Used Gear

All gear is tested prior to listing for sale. Any known issues will be mentioned in the item description.

We work extremely hard to make sure that you have peace of mind when buying pre-owned gear. 

You will have 14 days from receipt of the item to test and make sure that everything meets your expectations. 

If the item is found to be defective, we will cover return shipping. You must contact us first to set up the RMA. 

Any used items returned for reasons other than functionality (within this 14 days) will be subject to a 20% restocking fee. 

We will bend over backwards to make sure that you are happy with your purchase.

If you have any issues or questions at all please email or call us.  We are happy to assist!

Orders will be processed and handled within 1 business day in most cases.

Orders placed before 1pm PST during our business hours generally are shipped the same day.

We also offer expedited shipping. If you have any special requests please contact us first, and we will do our best to accommodate you.

Domestic Buyers

• We offer Free shipping on every item big or small to the lower 48 US States
• Hawaii, Alaska & Puerto Rico residents are subject to a handling fee, so please contact for quotes.
• We ship to APO & FPO addresses, but please contact for a quote. 
• We insure every package for the full amount 
• Any purchase over $200 will require a signature. THERE ARE NO EXCEPTIONS! 

International Buyers

• We ship via FedEx or USPS to most countries around the world
• Buyer is 100% responsible for ALL Duties & Taxes (VAT,etc.) imposed by your local government/ customs officials. 
• These are not included in our Shipping & Handling fees so please be aware before purchasing.
• International orders are usually delivered in 3-5 business days if there are no delays caused by customs or weather conditions.

Return Policy

• You must contact us for a RMA (Return Merchandise Authorization) within 30 days for new gear and 14 days for used gear.
• Items are subject to either a 15% (new gear) or 20% (used gear) restocking fee, unless found to be defective. 
• Customer is required to cover shipping using a trackable service with signature confirmation.
• We will cover return shipping for defective items and submit a return label via email.
• All new items must return in 'new' condition with all original packaging, warranty cards, and cables. 
• All used items must be returned in the same condition as picture & represented online.
• If new items arrive damaged and/or without original materials the RMA may be revoked or you may be subject to a 25% restocking fee. 
• If used items arrive damaged the RMA may be revoked or you may be subject to a 30% restocking fee. 
• Please allow up to 5 business days for us to process returns. Refunds, store credit or replacements will be handled within that time frame

If you experience a problem with a unit: do not attempt to open or repair the unit yourself. 

Any attempt to do so will void any warranty or guarantee. 

Please send us a detailed description of the problem you are experiencing and we will have a team member contact you as soon as possible.

International Buyers

We are not responsible for unit damaged due to use of improper voltage. 

Please make sure to double check voltage compatibility and use a proper voltage converter when necessary.

Our customer service hours are Monday through Friday, 10AM to 7PM Pacific Time.

Feel free to contact us

We are here to help, so if you don't get ahold of us leave a message and we'll be back with you as soon as possible.

Thanks!