Ensoniq SD-1 90's Polyphonic Digital Additive Synthesiser & Sequencer - 100V

  • Sale
  • Regular price $1,149.00

Ensoniq SD-1 90's Polyphonic Digital Additive Synthesiser & Sequencer - 100V

The SD-1 was released in 1990. It is an interesting digital synthesiser as it uses additive synthesis and waveform modulation to create sound, a kind of wavetable synthesis. This places the SD-1 among unique synthesisers such as the PPG Wave and Waldorf Microwave series. 

The SD-1 can create all sorts of acoustic, electric, digital, and analog-like sounds. Its piano sound has over 1 MB of 16-bit waveforms to give it a full and rich realistic tone not found in other digital synthesisers of the time.

The SD-1 has 21 voices of polyphony and a single patch can contain up to 6 of the 168 waves in its ROM memory that can be combined and layered. Advanced and analog-like synth parameters including its dual multi-mode digital filters, three 11-stage envelopes, LFO, and 15 modulation sources allow you to further shape and morph your sounds. There's even a dual effects processor with reverb, chorus, flanging and delay.

The SD-1 has a professional quality on-board sequencer making it a complete all-in-one music production workstation. This is a 24-track sequencer with 25,000 note capacity and it holds up to 60 sequences and 20 songs. 


  • This unit has been used.

  • This SD-1 has had a major service. All issues and faulty components were replaced. It has since been tested and we can confirm it is fully functional and sounding great!

  • Unfortunately the floppy disk drive is not working, however is not necessary to use the synthesiser or save or move sounds or sequences as it also has MIDI. This could be swapped out by a synth savvy person with a more modern USB or SD card emulator. 

  • The cosmetic condition of this unit is good. It shows some general wear from use and age like some text and paint finish which was worn off the front. The text is for the inputs and outputs on the back which is still clear on the back of the unit. It does not detract from use or functions of the machine. Please see photos for further details. 
  • It looks like they keys were lacquered with a clear, shiny coat in the past. Please see all photos for further details.

  • This SD-1 has had a brand new memory battery installed. 

  • Please be aware this unit is 100V. This means it MUST be used with a step-down transformer, not a travel adaptor. If you are unsure about this please let us know. We have some great, compatible step-downs for sale here: https://www.ebay.com.au/itm/173909299338 They are designed in Australia for use in Australia and can be run 24/7.

  • If you purchase from outside Australia you may need a step-down transformer to use this unit. Please contact us if you need any help sourcing the correct product. 

  • This sale is for the unit only. No other parts, cables or accessories are included unless mentioned above. 

Polyphony - 21 voices 

Oscillators - 1 to 6 per voice. Wavetable has 168 waveforms (multi-sampled acoustic instruments, sustained waveforms, harmonic and inharmonic structures) 3.5 MB ROM.


Filter - dual multi-mode digital filters

Envelopes - 3 11-stage envelopes

Sequencer - 25,000 note capacity (expandable to 75,000), 60 patterns, 20 songs

Effects - 24-bit Dual VLSI Multi-Effects: reverb, chorus, flanging, and delay

Keyboard - 61 keys (velocity and polyphonic aftertouch)

Memory - 180 Patches, 60 Performances

Control - MIDI (12-parts)

Date Produced - 1990


If you are in a remote area you may incur extra fees. 

International import tax, duty, vat, custom fees or any other charges are not covered by us, nor included in the shipping fees. These are the responsibility of the buyer.

Return Policy:

Returns will only be accepted for manufacture defects / faulty items. Please contact us if you have any problems with your purchase and we will strive to work it out with you.

Please contact us with any enquiries, and check our other listings for more pro audio and accessories.