Low Frequency Expander showing patch names and categories for Prophet 6 and OB-6

Published on Feb 18, 2020 Steve Hunt

"The LFE now stores patch names and categories. Each time a patch is selected on the synth, the LFE will display the name and category.

You can also step through all the patches in a particular category e.g. Lead so you can find a patch easily without having to memorise all 1000 patch names and categories.

Yorick Tech Ltd
contact yoricktechltd@gmail.com"

New Prophet-6 Styled LOW FREQUENCY EXPANDER by Yorick Tech

Yorick Tech, makers of the LOW FREQUENCY EXPANDER for the Sequential OB-6 and Prophet-6, have a newly skinned version with the look and feel of the Prophet-6. The previous version had the look and feel of the OB-6. See the Yorick Tech label for previous posts including demos.

Note this is a product from Steve Hunt's Yorick Tech and not associated with Sequential. This is an aftermarket product.

Update: the manual below has been updated as well.

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ob-6 low frequency expander

Note: Auction links are affiliate links for which the site may be compensated.

via this auction

Designed by Steve Hunt.

You can find some demos here.

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Low Frequency Expander - Demo of first 10 OB-6 factory patches with and without LFE

Published on Sep 8, 2019 Steve Hunt

"Low Frequency Expander - Demo of first 10 OB-6 factory patches with and without LFE"

OB-6 Low Frequency Expander

Published on Jul 29, 2019 Joseph McGinty

"Just received the Low Frequency Expander for the OB-6 (and Prophet 6) and doing some experimentation. Here, LFO 1 controls filter frequency, LFO 2 controls resonance and LFO 3 controls distortion amount. The envelope adds a subtle scoop in pitch to Osc 2. This module adds an incredible amount of flexibility to the OB-6. Thanks, Steve Hunt!"

Low Frequency Expander for DSI OB6, Sequential Prophet 6 and more - Yorick Tech

Published on May 4, 2019 GEOSynths

See the Yorick Tech label below for more.

Yorick Tech LOW FREQUENCY EXPANDER for OB-6 or Prophet 6 Manual

Click the images to view or print. See this post for some demos.

Text follows:

"LOW FREQUENCY EXPANDER For OB-6 or Prophet 6 By Yorick Tech

Introduction

Thanks for buying this Low Frequency Expander (LFE). I bought my OB-6 in February 2019 and loved the sound and build quality but quickly found it really lacked modulation possibilities. It’s got just one LFO, which is global (affects all 6 voices together), and lets you share the filter envelope to modulate a limited number of destinations. You can also use VCO 2 as a polyphonic (per-voice) LFO, but you lose a precious VCO by doing this. What I needed was a way of adding a number of extra modulators and to be able to route them to a lot more destinations. So I developed the Low Frequency Expander!

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Low Frequency Expander for OB-6. Demo of LFO 2.

Published on Apr 14, 2019 Steve Hunt

"Demo of LFO2. LFO1 is identical. SHIFT button lets me change the waveshape. For Tri and Sin, it changes the symmetry so it moves from saw up through tri (or sin) to saw down. With the ramp up and down, it changes the shape from exponential up, through linear to exponential down. For square it changes the pulse width. For the Step waveform, SHIFT determines how many steps there are. (Using a negative Amount will make the steps go down rather than up). For Random it changes the timebase, so the pulses occur more randomly as well as having random levels. For slew, it changes the slew rate between steps. For Walk, it changes the walking step size."

Low Frequency Expander for the OB6 & Prophet-6

Published on Apr 11, 2019 Steve Hunt

Playlist:
Low Frequency Expander for OB-6. Overview.
Low Frequency Expander for OB-6. No talking.
Low Frequency Expander for OB-6. Demo of LFO 2.
Low Frequency Expander for OB-6. Demo of LFO 3.

Update: you can reach out to Steve Hunt on YouTube if you are interested in one.

"My Low Frequency Expander for the OB6. Also will work with Prophet 6."

I reached out to Steve Hunt asking if this was a one off or if it will be made available for others. He replied: "Almost ready to make a few. Just a few software tweaks then another look at costs. Might make a batch of 10 if there's enough interest." If you are interested you can reach him on YouTube.

Here's some additional info on the features:

Envelope with 8 knobs: A1, L1, A2, D1, L2, D2, S, R. Plus amount.

So that's 6 stages. Loopable start to end of R or from start to end of D2.

Syncable to midi clock.

Alternate mode is 8-step control sequencer using the 8 knobs as levels.

Thinking about using a shift key to add 8 more steps LFO1 sync, wave, frequency, amount.

LFO2 sync, wave, frequency, amount.

LFO3, sync, frequency.

sampling frequency, wave shape (continuous from ramp through triangle to saw), pattern, amount.

Generates smooth waveforms or sample/held steps depending on sample frequency knob.

All four modulators can be multiplied by a source including velocity, AT, mod wheel, the other modulators etc and can all be sent to any of the synth's CC destinations.

So for example, the Envelope can be multiplied by the output of LFO 3 and sent to Resonance and LFO 1 can be multiplied by aftertouch and sent to PWM1...

Dedicated distortion knob.

'Engage' button to enable/disable all outputs.

'Write' button.

'Shift' button. eg shift-write makes init patch. shift-wave decrements the wave selection.

1000 patch storage locations synced to the synth's patch numbers.

Large 20x4 red OLED. Midi in, out and thru.

Update2: via Steve Hunt on YouTube

"Costs and timescales.

I've done a lot of work on reducing cost. I've removed a PCB so there's only one, removed an IC and about 25 smaller components and found a cheaper supplier of the aluminium front panel. All totaling a saving of £90 , in 10 off quantity.

The front panel has a lead time of 3-4 weeks and I've not used the supplier before so I want to buy one for myself to check it out before I buy a batch. That means the first deliveries can be about 7-8 weeks from now.

So if I can get 10 deposits from you of £100 each, I can order the long lead-time components and ask you for the balance before shipping out. If you want to take part in this first batch of 10 then email me to discuss paying the deposit etc.
stevehunt99@gmail.com

I'm offering three options:

Standard: Metal box with aluminium front panel. £440. plus postage.
Deluxe: As above but with walnut end pieces. £480 plus postage.
Bones: for those that want to make/source their own box and panel, just assembled electronics and knobs. As above but no panel or box. £345 plus postage.

Or I could put it through a platform like eBay or Kickstarter and add 10% to cover their fees.

No VAT to add as I'm not VAT registered but I expect some countries will want to add taxes or duty to what you pay, but I think you pay them when importing.

Unless Behringer or someone else with a Chinese factory buy the design off me or rip it off, that's as far as I can go on price, unless volumes really take off, but I'm taking it one (small) step at a time.

I will also offer an analog I/O option for all of the above but I haven't costed this yet. It will add one CV in and one CV out. There aren't any long lead-time items in it and it can be added to your order a lot later."