Category Archives: Sequential Synths

Deluded musician thinks he has enough synthesizers now, Sequential Pro 3 joins studio

Will 4 flagship level synths satisfy?

Think so, hope so.

Adding the Sequential Pro 3 to the Sequential Pro 2, Sequential Prophet X and Waldorf Quantum really touches all sound worlds I need to touch. Now I desperately need some Jaspar stands and new studio monitors.

Like any synthesizer addict, I’d love to have hundreds of all synth persuasions, but space is at a premium, as is time to effectively learn and use the synths.


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Replacing the Sequential Prophet X Keybed

Replacing the Prophet X keybed is very easy

Removing and/or replacing the keybed on the Sequential Prophet X synthesizer is a relatively simple process involving nothing more than a screwdriver.

***Thanks to Tom Fabinski for his keybed sacrifices and sharing the info and images for this post!

To start, unplug all power/audio/MIDI/USB cables

Instructions for replacing the key bed are as follows.

  1. Unscrew the screws in the wood ends (see WoodRightSide.jpg and WoodLeftSide.jpg above)
  2. Flip the instrument over and place it face down on a soft material.
  3. Unscrew the two screws which hold the wheel assembly to the bottom metal work (see WheelToMetalScrews.jpg above)
  4. Flip the instrument back over and remove the screws in the sides of the metal housing (see ScrewsRightSide.jpg and ScrewLeftSide.jpg above)
  5. The front panel can now be opened, it is hinged at its rear.
  6. Remove the key bed connectors and aftertouch cable connector from the main PC board (see MainBoard.jpg above, the cables outlined in red)
  7. Close the front panel and flip the instrument face down again.
  8. Remove the 10 screws which hold the key bed to the bottom metal work (see KeybedScrews.jpg above)
  9. While holding the front panel closed, and the key bed to the bottom metal work, carefully flip the instrument front side up. Open the front panel, and remove the key bed.
  10. Remove the aftertouch extension cable from the old key bed to install on the new key bed. It is taped in place.
  11. Install the new key bed and reassemble the synth in the reverse order of disassembly. Take care when re-installing the key bed screws as they can strip the key bed standoffs if they are overly tightened.

IMPORTANT: The keybed standoffs are plastic. To avoid over-tightening and stripping standoffs when installing the keybed, DO NOT use an electric or powered screwdriver.


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Updated periodically – Sequential Prophet X or Waldorf Quantum?
Updated periodically – Prophet X Samples & Utilities

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Sequential Pro 2 gets all new wood ends + front strip

A great support experience and better than new wood

One day I was being lazy, and I leaned my bicycle up against my synths and wouldn’t you know it, somehow I scratched the front strip of my beloved Sequential Pro 2 synthesizer. Yeah, I know it was a fairly insignificant scratch but it just bugged me, so I decided to order replacement parts from Sequential. I ordered the end pieces too, just to be sure the wood stain/finish all matched since I was already going full on OCD, ha! I’m glad I did too, because the replacements looked a lot better than the originals. Darker and a little more sheen to them. Anyhoo, it was a great support experience from Mark Kono at Sequential Support. $75 total including freight for the left+right end pieces and the front strip (including Pro 2 badge) and now, better than new.

The wood ends are a snap to replace, but the front strip is a tad more complicated – fortunately Mark gave me instructions, which follows these images of my parts replacement.

Note: This would be essentially the same procedure to replace the keybed.

Sequential instructions:

You’ll need to remove the keybed as there are screws holding the front wood strip from the bottom of the keyboard as well as from the inside (you’ll see them under the lip of the front once the keybed is removed).

Removing and/or replacing the keybed on the Pro 2 is a relatively simple process involving nothing more than a screwdriver. Here are instructions for replacing the keybed:

To start, unplug all power/audio/MIDI/USB cables.

  1. Unscrew the two screws in each of the wooden sides.
  2. Once the wooden sides are removed, 3 additional screws on the left and 2 additional screws on the right side will be revealed. Remove these as well.
  3. Next, lay down some padding like a towel or a pillow and flip the Pro 2 over. Remove the 2 black screws to the right of the left front rubber foot. They are smaller than the other black screws, they have no flanges, and will be slightly lower than the foot, not directly inline.
  4. Flip the Pro 2 back over and with it facing you place your hands on the sides, on top half of the metalwork, and lift up and away from you. The lid will hinge open and stay open resting on the attached lanyard. You will be looking at the main board in the tray above the keybed.
  5. Remove the 2-wire aftertouch connector from the main board, it is located in the lower left corner. Pull straight up on the connector, DO NOT pull the wires themselves.
  6. Remove the keybed’s ribbon connector, it is located in the lower right of the main board. There are locking tabs holding the ribbon cable in but they are easily opened by prying the tabs away from each other in a horizontal motion with your thumbs or fingers; the cable will just pop out. Only medium force is required.
    • When reinstalling the ribbon with the tabs open, just push the connector straight down and the tabs will close behind it. Push the tabs together to make sure the cable is firmly seated.
  7. With the two connectors detached, close the lid and flip the unit over, face down, and rest the keys on a soft surface.
  8. Remove the 10 screws holding the keybed in from the bottom of the Pro 2. The screws are aligned in 2 horizontal rows of 5 black screws each, located just above the lower rubber feet. The keybed is now detached. Hold the keybed in place and flip the unit back over. The keybed can now be removed.
  9. Reassemble the Pro 2 in the reverse order.

IMPORTANT: The keybed standoffs are plastic. To avoid over-tightening and stripping standoffs when installing the keybed, DO NOT use an electric or powered screwdriver.


More revolutionOSC Sequential Pro 2 related articles
August 23, 2019 – Sequential Pro 2 gets all new wood ends + front strip 
May 17, 2019 – Sequential Pro 2 officially discontinued
May 12, 2018 – First look at the Sequential Pro 2

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First look at the Sequential Pro 2

This year’s flagship control center synthesizer winner

I got my Sequential Pro 2 eight days ago from, a process made very efficient and informative by my sales engineer Chris Goldbach.

In case you are not familiar, Dave Smith is the original founder of Sequential Circuits, and designer of the Prophet 5 synthesizer, the world’s first microprocessor-based musical instrument and also the first programmable polyphonic synth. He was also a co-creator of MIDI.

The Dave Smith Instruments Pro 2, introduced in 2014, is a descendant of the Sequential Circuits Pro-One, their first and only monophonic synth, a classic built in 1981. The Pro 2 is DSI’s flagship monophonic synthesizer, and Dave Smith says it is his “most powerful mono synth ever”. I believe him.

The first thing you notice about the made in the USA Pro 2 is, wow, this thing is really built. It is solid. My general perception of DSI is they don’t constantly discontinue models and release new ones. Their products seem to be very advanced at time of release and stay relevant for some time to come. With 4 years so far on the market, the Pro 2 software appears very stable and debugged. Mine came with the newest OS v1.3.0 installed.

I haven’t spent a great deal of time playing this synth yet but I did say to myself on day one, I really like this machine. It completely revamped how I thought a group of synths should be configured and what the pieces should be.

Gear acquisition syndrome, I’m sure it affects all of us. Previous to getting the Pro 2, I could easily envision have 10+ synths working together. Now I’m thinking fewer full scale synths but higher quality ones, and definitely with CV in/outs. Modular, an area I’m very interested in, different issue. That I am sure will be where gear acquisition syndrome finally kills me, but oh well…

A better master clock than the BeatStep Pro or a DAW

First of all having 3 MIDI ports (in, out, out/thru) is a real bonus. The way I use my hardware/software, I do not like to have all of it on constantly. Mostly I use the Pro 2 by itself, in which it is a good thing to be master clock, because if it is not the master and there is no clock signal because that hardware is not turned on, in slave modes the arpeggiator and sequencer do not work.

Currently I have MIDI Out going to hardware like my Roland TR-8 and Korg Minilogue. MIDI Out 2 goes to the BeatStep Pro which is sequencing a DAW (Tracktion or Ableton) with soft synth VST plugins. This seems to work out real well and is very stable.

I’m not an analog purist, however…

Generally I lean to analog, but DSI sold me on hybrid, that is to say it has digital oscillators and an analog signal path. It’s easy to make the Pro 2’s digital oscillators sound analog. To have near instant on status is a joy, and the additional wave-forms that digital oscillators add really rocks in my opinion. I’m going to do a cut & paste from the Sequential Specs so you see what I am talking about:


  • Four DSP-based oscillators plus one sine wave sub oscillator
  • Four classic wave shapes (saw, square, triangle, sine) per oscillator
  • Twelve selectable complex shapes per oscillator
  • Thirteen Superwaves
  • Three noise types per oscillator: white, pink, violet
  • Shape modulation/pulse width/superwave detune amount
  • Oscillator cross modulation: frequency modulation (FM) and amplitude modulation (AM)
  • Hard sync, individual Glide, Oscillator Slop

The paraphonic capabilities really are unique, not only allowing 4 oscillator/note polyphony but each oscillator/note has its own envelope, unlike every other monophonic/paraphonic synthesizer I know of, which share one envelope. The dual filters which can be run in series or parallel can also be split, oscillator 1 & 2 on 1 filter, oscillator 3 & 4 on the other.

There are 792 presets, half factory set and non-writable, and the other half user-writable (containing the same programs/sequences, you can modify, replace or delete as you wish).

The sequencer looks like a real gem

I’m going to post more about the sequencer later, but I will say this is an important part of why I decided to make the Dave Smith Instruments Pro 2 the control center of my setup. I have never been that impressed with lower cost synths’ sequencers, which is why I added the BeatStep Pro, which while a big jump from many sequencers, still doesn’t super impress me. Well OK I’ll give the BeatStep Pro a medium impress.

Dave Smith Instruments Pro 2 sequencer impresses me. We’ll see if I can get it to do what I am thinking… More later when I finish fleshing it out.

The biggest ‘problem’ I have with the Dave Smith Instruments Pro 2 is that in researching it I discovered Dave Smith’s Sequential Prophet X. $4k, maybe not this year, ha! But I am seeing the value in it, more later.


More revolutionOSC Sequential Pro 2 related articles
August 23, 2019 – Sequential Pro 2 gets all new wood ends + front strip 
May 17, 2019 – Sequential Pro 2 officially discontinued
May 12, 2018 – First look at the Sequential Pro 2

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revolutionOSC Facebook Group