Siel DK70

Siel DK70 Image

The DK70 is a fully programmable, battery powered portable synthesizer featuring subtractive synthesis using DCO, VCF and VCA technology (similar to Roland's Alpha Juno series). It has a polyphony of 8 voices in normal mode and 4 voices in dual mode. There are 50 memory patches (40 preset, 10 user) but that could be expanded to 100 with additional ROM or RAM cartridges. Editing and creating sounds is a behind the scenes affair - that is, not for real time or live use. With only a handful of press buttons for all data entry, editing is very tedious and boring.

So stick with the presets or pre-program and store your own sounds for later because this synth is otherwise aimed right at the live user - battery powered, lightweight, built-in guitar strap hooks and an optional "Stage Set" Grip with pitch ribbon, modulation depth, program change and octave +/- controls. The 49-note keyboard does not have velocity sensitivity. It also has a chorus effect and a simple two track sequencer which can store up to 200 notes. This cheap synth is great for string sounds, pads, bass and strange noises. Although similarly designed synths like the Roland Alpha Juno and Korg Poly 800 often seem more popular, many users have found the DK70 to have warmer and more 'analog' qualities from its VCF and VCA sections. The DK70 is probably an underrated synth and definitely worth checking out if you ever come across one.

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8 Visitor comments
December 21, 2010 @ 7:23 pm
Got one of these a few months ago for cheap after a local shop messed up an ebay sale (some akai sampler part, irrelevant). They couldn't figure out if it worked so I got it for $50 and an apology. One of the best deals I've ever gotten. The real strength of this is in the strings and pads in combination with the Chord Memory function, you can get bright & woolly CM patches for house and techno or moody pads for dnb or whatever. Sample the chord into your hardware sampler of choice and the possibilities are endless.

The block layout is similar to the Poly-800, but the filters don't have that muddy Korg quality to them so the sound of the DK-70 is totally different. Totally slept on polysynth right here.
Rob Parker
February 21, 2009 @ 7:25 am
Kinda reminds me of a Korg Prophecy :)
February 6, 2009 @ 5:45 am
I bought one of these a week ago, and i think that this is a great machine.
The sound editing is quite tedious indeed, but in under 4 days i came up with some really dope DnB basslines, a very fat detuned reese and some bubble basses. It makes also great funky leads, and if you have one, visit this site >>
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Rated 3.2 (99 Votes)

  • Check Price
  • The link above will take you to an eBay search for this synth to see active listings. If you don't find it there, try looking in our forum marketplace or post a wanted classified.
  • Demos & Media
  • Manual - Download the original owner's manual from

  • Specifications
  • Polyphony - 8 voices (or 4 voice 'Dual Mode' with 2 DCOs per voice)
  • Oscillators - 8 DCO's (Square / Saw-tooth).
  • Filter - VCF: 1 resonant 24dB/Octave (4 pole) Low-Pass filter
  • Envelopes - VCA: ADSR envelope, triggered by gate or LFO
  • LFO - One
  • Effects - Chorus
  • Arpeg/Seq - 2 track polyphonic sequencer
  • Keyboard - 49 keys (Split/layer)
  • Memory - 40 preset, 10 user
  • Control - MIDI In/Out/Thru
  • Date Produced - 1985

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