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  The Accord Sequarallel
Eurorack Module
by SDS Digital
 

The Sequarallel CV to Chords Sequencer module may be perfect for you!
 

Introducing the SDS Digital Accord Series Sequarallel!

One thing that we hear a lot from modular enthusiasts is how daunting it is to use a computer while performing. I myself have done this and it doesn't always work out as expected. It's especially difficult to load & run sequences from a dark screen outdoors, or amongst a mess of haphazard wires strewn about the stage, you get the picture.

In our constant endeavor to oust the computer from the world of modular we have come up with another module that replaces sequencer software. OK, a DAW MIDI player is still preferable to play the MIDI that Sequarallel can record, but modular clocked MIDI, tracker sequences, and Layered MIDI can be recorded directly from a keyboard or controller if that's more your application.
There is enough on-board memory to record many hours of MIDI sequences, loops, layers, and tracks.

What Does This Module do?
The Sequarallel is, from the panel point of view, a 4 CV channel + MIDI Sequencer that will play your VCO's and envelope generators or filters like a pro!
Regular Sequencers are fine for stepped beats running on a clock but creating the sequence is both time consuming and very tweaky. In many applications they have their place, but for a truly complex and intricate sequence, it seems we always turn to the computer, then patch it's output to a converter for gates, triggers and CV's for modular.

This module bypasses all of the hardware/software and does the sequences on it's own! In standby it can still keep up with the best of MIDI2CV modules, but with stand-alone sequencing it really shines! Sequences can be modified via Note Transforms like Mirror, proximity scaling, inversion, probability, glide, glissando, pitch bend, and Transpose. Most of these can be controlled with a CV input to one of the 3 bi-directional jacks, or with the MIDI Remote function from any MIDI controller.

There's Selectable Global Automation recording, for MIDI or internal FX, multiple sequencer tracks with adjustable on-board FX, and an intuitive Play List to create a song from all of the loops, TRAX, and MIDI Layers, that is very editable and modifiable.
As quoted "The Sequarallel is basically a DAW in 8HP!"

Looping?
Up to 16 Song Loop/Jump markers can be set within a recorded MIDI Song. TRAX Tracker' Sequencers (up to 5 at once from a selection of 40 per Song Project) Loop points can vary dynamically from 4 to 64 steps and can be controlled per Play List block. Live MIDI Recorded Layers will follow Song Loop's sizes by default (whether real Song exists or not) as a multiple so everything is easy to sync. The Playlist groups (of blocks) will loop depending on the sequential block's positions. If there is no active block to fall into in the Play List, each track will loop to the top of that group until directed elsewhere.  This means there is a pointer for each track and they can be all different sizes.

Layering?
Up to 5 sets of Layers can be recorded into a Song Project. Layers can either be merged into themselves (with undo, individual mute) or create a new set with each Loop for random solo or muting from the main screen. Each time a Layer does Merge (up to 8 times / Layer button) a new Letter is created and the Layer sub-sequencer moved to the next Step with all the previous Layers included. If in "Live" mode this process will play in real time, offering Live inserts of new inputs as you go. Editing the Layer sub-sequence can add loops, or remove some Layers from the mix. Up to 32 Play heads!

Layer recording can be left on with an intelligent insertion without any degradation or memory use from un-used loops making it a powerful inspiration tool. Special piano keys or controllers can be assigned to control Layer solo, mute, record and removal.

Sequencing?
Besides the real-time MIDI Recording and Layering features, the Sequarallel has 5 unique 4 Lane Wide TRAX tracker-style sequencers. From 4 to 64 steps at any clock ratio, notes can be added one at a time, or played in via MIDI to be quantized into the sequence live.
Each TRAX tracker has it's own FX pool of 8 FX configurations that can be applied by the note, lane, or group of steps. Some of these FX are Echo or Ratcheting with pitch-step option, randomization, probability, glide, MIDI CC values, ducking, instrument change, tuning...

Special keyboard keys can erase sections of sequence, stack lanes, and overlay notes without changing FX, lengths, or velocities, making it perfect for an ever-morphing clock-accurate sequence for Live embellishment.

MIDI MPE Compatible?
Yes, the Sequarallel will accept MPE format (and detect zone configuration messages) for up to 4 note zones on the panel. Zones larger than 4 notes will still be sent on through MIDI out. All 4 rows can be configured to proper channels by selecting MPE0 or MPE1.
Pitch Bend is applied to the CV outputs of course, but the 4 CC/VEL jacks can be configured to one of the remaining 4 expression elements to control your VCO modulation, filters, etc.

Is This Module Complicated to Learn?
Not at all!
It can be deep, but easy to learn the basics, designed with ease of use a priority.
If you like Sequencing, the TRAX trackers are easy to add notes & FX to for an immediate start, or if you're impatient like me, 4 lane sequences can be recorded directly from any keyboard.
If you like perfectly auto-tuned VCO's every time, the Sequarallel remembers, by name, up to 8 VCO's per jack row.
If you have DAW sequences you'd like to "modularize" it's just a matter of arranging them and recording them in.
If controlling a modular sequencer live via MIDI controllers or swapping pre-made patterns to DJ standards is a must, Remote has it.
If you like to free-style play and build up a track as inspiration hits, Layering has got you covered.
If you want to take your favorite downloaded Song and use parts of it for your loops, twisting it beyond recognition SongFX is your thing.
If you want to compose a whole song from all these elements, the Play List will make it happen.

Scrolling through the on-screen Quick-Box buttons makes changing parameters as easy as possible, and can held down to enter lists, editors or lesser changed settings "behind" the Quick-Box. Some Quick-Boxes open up when clicked to select one of several quick-change parameters similar a browser selector box.
 


Shown:
Pre-Release 2020

Gate & CV Outputs 4 Rows of Gate + CV (@1V/Oct or Hz/V) can be assigned to any MIDI channel(s) to work together or apart. Thus, these will output to ENV-VCA-VCO's from MIDI song & Layers/TRAX trackers/or MIDI input based on a set priority level. The CC/VEL jacks can be set to reflect Velocity values. The 12 jack grid can optionally output drum triggers instead.
4 ENVELOPES Each Song Project can hold 4 envelopes that can be combined with Velocities to directly control a VCA or filter. 3 types, ADDSR, CV record Draw, Parametric Draw, can be created according to requirements and used with sequencer/MIDI in/Song notes, or events to trigger, or just free-run as an LFO with a sync-up option. Waveforms Bipolar or positive only.
MIDI OUT The MIDI Recorded is exactly duplicated during playback with all of the nuances like Program Changes, CC changes, Notes on all channels, and Percussion. MIDI and LINK (backplane) support MPE and can be separated to MIDI channels.
MIDI IN / Merge MIDI received at MIDI in jack or LINK (backplane) is merged with MIDI out. This also is used for Song & Layer recording
6 x CC /Mod Outputs These jacks can output note-triggered envelopes, or send MIDI CC values recorded with song, or recorded  into Layers later on. The Jacks on tracks 1-4 can be Velocity, After touch, Pitch Bend, CC 5 & 6 can be configured as CV inputs to control many panel controlled parameters, or insert MIDI CC or Pitch Bends to selected MIDI Channels playing or live via MIDI input. All CV I/O are bi-polar -5V to +5V, or 0 to 10V
Loops and Jumps A recorded sequence can be broken up into smaller loops if it is long (i.e. a song) by special notes inserted in the original sequence recorded, or afterward on the display. Using JumpTo and Loop on/off you can bounce around inside a sequence to make it play longer or forever! These can also be arranged in the Play List.
Live Transposing The entire MIDI sequence, MIDI output and CV's, can be instantly transposed. This change happens only on bars so a simple sequence can be "played" by transposing. A great added feature to the Sequarallel is panel actions can be automated so a transposing sequence can be used throughout the sequence loops.
Live MIDI2CV When not playing a sequence, the MIDI input becomes active so can be used to simply convert MIDI to CV. This is great for auditioning a sequence before recording it, or, if you must, using modular with MIDI sync from a DAW. The Clock output will be the source for your rack.
Drum Triggers When switched to Drums Mode, MIDI Channel (10) is ported to the 12 jacks as percussion triggers from any source (MIDI,TRAX). The MIDI notes for each drum used is shown on the display as a grid that highlights blocks when the trigger is played.
Transpose Global Transpose Quick-Box on-screen button is quick access and can also be automated.
62 Songs Projects! Up to 62 Songs (AKA Projects) can be stored at once. Each includes a recorded MIDI song, added Layers, TRAX tracker sequences, Envelopes, automation, and Play List Arranger.
TRAX Tracker Separate from MIDI Layering and the MIDI Song, Trax Trackers have their own tracks in the main Play List. Each track can have up to 8 different Trax Sequences (64 steps) in any order, with any clock division/multiplication, plus Trax from other Songs.
Each Trax Sequence is 4 lanes wide and boasts Note-level FX groups (like echo, ratchet with pitch shift, length, CC trigs etc)
Link-able Two Sequarallel's can be MIDI linked together for even more power. When linked, the second Sequarallel can act as a MIDI channel extension and sequence with the master, doubling TRAX, Layer, and percussion count.
Up to 24 drum triggers can also be realized if that's your thing. The Sequarallel will also link to our Accord Melisma for increased functionality of both modules (i.e. MIDI merging, Root control, G/V/CV break out)
Automation Recorder All panel, Assigned CV, and MIDI remote invoked changes to the sequence can be recorded (up to 64 bars) and looped immediately. AUTOREC is not Sequence position dependent so can be used to turn on/off Loops, jump to other markers, turn tracks on/off, transpose, etc. to free you up to do other things. Dynamically flowing, without any jumps, AUTOREC changes applied will completely change the sound of a sequence in such interesting and dynamic ways!
Layer Recording Record Layers while a sequence is playing, or alone, from a keyboard or any MIDI controller. Layers Record can be left recording to free the player from managing the module while in a creative spin! This is great for building up a section of a sequence or song, then returning to the main sequence original by peeling or muting.  Layers can also be saved permanently with the Song.
 
Display: On the left side of the display, 4 large notes are displayed as they are played (live) or sequenced out to CV.
During Drums mode there are 12 boxes (with note#'s) that highlight when a percussion trigger occurs
On the right side are the "Quick Boxes" that can be scrolled up/down to. Quick Boxes are essentially buttons.
 
MIDI in Trigger MIDI Input, when not being used for MIDI, can accept trigger input pulse to start / reset / stop sequences, queue Jumps (defined by CV input to Clock out jack, notice the arrow on the panel).
 
Select Bus This module can act as a Eurorack Select Bus master or slave. All 62 Song Projects can be recalled when a slave. Several other alternate functions can be accessed via Select Bus.
CV Fine Tune /Auto-tune Each 1V/Octave CV has it's own fine tuning +/- 100 cents, and there's a master Fine Tune Quick-Box to add a bit of sharpness to all VCO's quickly. Each jack also has a MIDI "zero note" (default is 36) for VCO's not tuned.
For even finer tuning, Auto-Tune perfectly tunes those stubborn non-linear gain VCO's.
For Hz connoisseurs, there's 11 point bi-polar auto-tune using the MIDI in jack. You could even tune a 555 oscillator!
MIDI Remote MIDI Remote can be used to control internal functions and Play List control via groups of global assignment parameters. These reside on a set MIDI channel and allow instant control of FX, FX Masking, Loops, and even automation triggers, giving you DJ-like control without actually touching the panel.
VCO Auto-Tune Each CV Output Jack can be auto-tuned for up to 8 of your favorite VCO's. VCO's can be 1V/Octave, V/Hz, or even just a 555 timer really. Auto-tune will lock onto it and tune it to perfection. No more out of tune VCO's !
Dynamic MIDI2CV "CV Modes" can be instantly selected (setup beforehand by you) to assign different MIDI channels to jacks and control how chords stack and play out with the "Order" Quick-Box. As a bonus side-effect, multiple tracks can be brought out to the Gate+CV jacks from different MIDI channels as they play with configuring each time.
FX FX FX!! Multiple FX settings reside in a "bundle". Song Loops have 16 FX bundles to use, TRAX trackers have 8 NoteFX bundles each and 8 track FX override bundles in the Play List, while Layers has direct FX controls or can ride on some Song Loop FX.
I haven't counted but there are probably close to 400 FX bundles total each tailored to it's sequencer type.
i.e. TRAX tracker's per-note-FX have Micro-Arp sequences for Ratcheting and Echoing notes, direct MIDI CC outputs, glide, PC, Fine tune (PW), probability, parameter randomizer ++ and a mask sequencer to stop FX on certain steps. So much more!

Whether you want to sequence simple triggers or a complex rhythm, or a whole song, the Sequarallel gets the job done!

 

My own testimonial to HW sequencing and the origins of the Sequarallel:

For a time over the past few years I have performed with a laptop sequencing backing instruments and controlling MIDI hardware. Things didn't always go as planned. Sometimes minor issues would go un-noticed, while other total crash scenarios were a total show-stopper. That feeling of hopelessness resonated in my soul since then and I have made it a #1 goal to eradicate the computer from the stage entirely!

I have designed and built a few MIDI-controlled stage lighting fixtures to run during loaded backing for songs I performed, plus elaborate software control requiring only a 3 digit number be entered and everything loads up. At that time a good part of the the audio processing and MIDI instruments were software based but mixed with hardware like Korgs & Yamaha synths/drums. All of this controlled via MIDI from the PC.

So to pull the PC out of the loop, and get total control over my TC Helicon VoiceLive Touch 2 vocal FX unit, I designed a pedal board called "Pedal 7" (shown right>>)
 This combines manual and automatic control over 4 MIDI I/O, modular interfacing, sample player, running tap-tempo, and a great sequencer to meld it all together.
That sequencer is what I based the Sequarallel on.


The Pedal-7, origin of the Sequarallel!

On-Going Development:
Now 2021 has come up, development has recommenced with the plan to continue going until release. The original date was put off due to issues with supply during the pandemic, but as a result the Sequarallel has become a much more powerful and capable module! There have been 3 re-programming's and two major paradigm shifts over the past 10 months. (and they continue to evolve! See "Recent improvements" below)
Once the module is released, firmware updates may follow as customer needs/requests are weighed in and perhaps implemented to further improve the Sequarallel. (Hey, we can't think of everything right?)

Demonstration and Development Videos

  Testing Testing 1 2 3 ...

This is the first video exposing the Sequarallel prototype to le grand public. It was a test video to visualize flaws but went pretty good so I thought I'd post it on youtube with some text descriptions of what's going on ( so as not to interfere with the sound -with my voice )

Oddly the display looks crooked but it's not that much! The final modules won't be (we hope!)

Looping and transposing is many demonstrated in this video, but the Drum mode is shown and clock alignment goes without say :)

 

  This video is a bit more formatted and demonstrates the Loop Markers.

The JumpTo Quick-Box wasn't yet functional

This short video demonstrates the TRAX (using #2) Tracker's Shift feature, shifting individual lanes and inadvertently Recording in a short progression via MIDI.

Shift rotates all notes in a selected lane with each click of the encoder. The Shift can be used in conjunction with "SKIP" to only shift every 2nd, 3rd, 4th etc. step.

As it destructively updates the sequence, changing the SKIP setting and re-shifting can jumble the orders up with surprising results! Shift can be used to shift all lanes together, and possibly using the RANGE parameter to only shift within a certain area (TBD) This can be achieved now by simply changing the Start/End parameters found further down the QB pop-up SHIFT is in.

This Spring 2020 Introduction video mainly focuses on the new TRAX Tracker features but gives you an idea of the workflow and how it looks now. Note that the Play List has drastically changed since then!

The first 3:30 is all splash, then a light "how to" for DAW recording and  TRAX trackers.

This demonstration/tutorial video covers the TRAX Tracker Remote extension for MIDI CC control on the TRAX remote MIDI Channel.

This feature is different from recording notes into the tracker from a keyboard in that it's similar to traditional Sequencer control of each step.

We think it's a good addition to the Sequarallel and have decided it should stay!


Samples:

Here are some samples of the Sequencer in Action.

NewSoloDucking-NoteFX.mp3
TRAX SOLO DUCKING can briefly take SOLO control over everything playing, for just on step perhaps, but stops notes piling and offers interesting fills / breaks
 
VCOsTuned.mp3
Here's some stubborn VCO's tuned to perfection with the Sequar's Auto-Tune. 2 VCO's are SDS_VCO, one a Hz/volt, and one more an actual 555 timer osc. on a wish board.
Dj'ing Song FX.mp3
This is SongFX manipulating Loops created from a downloaded version of "Do ya think I'm Sexy" by Rod Steward. These were all in the Play List I believe but I was playing with the blocks.
NameThatTune2.mp3
Here's a couple of downloaded MIDI Songs I chopped into Loops and applied different SongFX to (yay mirror!). Guess the tunes!
I threw in some short un-FX'ed bits to help but you must admit, unless you're very familiar without those it'd be hard to know!
Dev-Collage.mp3
This is is a whole bunch of little tunes I played around with while developing the Sequarallel in the fall. I made this recording to inspire myself while I did a re-write for a memory expansion! I knew it wouldn't be working for a while, guess I could of put another module together hehe.
 
PianoTRAXs.mp3
This is unintentionally humanized piano sequences from TRAX sequences. The tempo is slow so you can hear some Echo-Arp-Sequences going on plainly and the way they overlap. I think Echo, now expanded to 8x,  is truly one of the better NoteFX in the TRAX sequencers.


Support:

Preliminary Quick-Start Guide (Jan 2021): Sequar-QuickStart.pdf

Eventually Support items will be listed here as well as the User's Guide (which is underway)


^Back to Top^


As this module is not yet available, this page will be changing and is still under development. Of course the more in-depth functions and capabilities are not listed here yet so stay tuned!

Recent improvements:
May 2020:  Added TRAX Swing Map sub-sequencer to mask swing, with size 3 to 16 steps, for humanizing.
June 2020: Added Auto-Tune / pre-tuned VCO selection. Plan to integrate this into sysex loads of converted Scala scales (for CV)
June 2020: Added TRAX "Solo Ducking" NoteFX that Solos notes briefly, or adds them to the Solo Group briefly. Summer break!
Sept 2020: Changed the way a song is stored and added true-time Ring buffer to make "hanging notes" impossible.
Oct 2020:   Added Song Loop FX sub-sequencer to greatly improve unique modification of Loops.
Nov 2020:  Gave Layers individual Layer access with up to 32 simultaneous play heads and Layer sub-sequencer for including them
Nov 2020:  Added mini-meters to TRAX QB's in main screen so can see who's doing what!
Dec 2020:  Doubled on-board volatile memory for bigger songs. Easy HW modification.  Took break for holiday season, other projects
Jan 2020:   Added TRAX Tracker Remote MIDI CC Step Sequencer Control feature (made video)
Jan 2020:   Doubled the 4 Envelope Sizes and added a new waveform creation method "Parameter" to use a form & math to make waves
Jan 2020:   Added Project auto-save-backup to recover a project in rare case of a power cut during a save
Jan 2020:   Changed CV MODE's fixed "All 4,3+1,2+2,1+1+1+1" modes to 4 completely configurable configs to assign Gate/CV/CC jacks
 

You can find the Sequarallel on Modular Grid at https://www.modulargrid.net/e/sds-digital-sequarallel and at Muff's forum (search)

You can contact me at fresh@freshnelly.com with any questions or requests

Thanks for checking out the Accord Sequarallel !

 

Last Update: Jan 21, 2021


SDS DIGITAL 2019