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This is the Crown Jewel from BYOC.  I also added the 27v Boost and an octave up circuit. 



Here is a demo:

This was recorded direct

Nice! I've been curious about the clock board add-on, as I've built a few PedalPCB FV-1 projects now. Might have to try it on the next one.

I would definately recommend the clock board! It adds more versatility to an already very versatile build.

I finished this build a while back.  It is the Octagon from pedalpcb with an additional tone control. I also added the FV-1 clock module board with the option to switch between two different sample rate settings.   Nothing special looks wise but I like the way it sounds.



Here is a demo:

I have been breadboarding a circuit with the hopes of using PT2399 chips in series to get long delay times similar to the Deathklaw, Sagan Delay, etc.  I'm having an issue getting the delay chips to each have the same delay time.  I currently have it set up like the Deathklaw current mirror section of the circuit.  The longer I have the delay time set, the more the delays don't seem to be synced with each other.  If I have a delay time of 300ms at the first chip, I would think I that I should get another 300ms from the second totaling 600ms.  Instead the longer the delay time is from the first delay, the second delay gets much longer than the first delay.  For example, if delay 1 is at 200ms, delay 2 is 300ms totalling 500ms.  If delay 1 is at 300ms delay 2 is at 900ms, totalling 1200 ms.  If delay 1 is at 500ms, delay 2 is at 2000ms totalling 2500ms.  These are guesses of exact delay times but I can't think of a better way to describe my issue.

I have built both the Deathklaw and Sagan delay and neither behave this way which makes me think I'm messing something up but I have checked things over and over and started from scratch and keep getting the same result.

If anyone has any suggestions I would really appreciate them!

Finally have a demo

I just tried blending the cv with 5V with a 1k pot for the LED and that seemed to do the trick. I'll eventually order some different photocells but for now this seems to work. Thank you all for the help!

Thank you! It seems obvious once having it explained to me..
I measured the voltage between the tip and ring from the output of the sequencer and the max range I got was 0-5V.  If I set it to a smaller range the minimum voltage stays the same but max voltage is reduced.  I'm not sure how to modify it to have the LEDs minimum brightness brighter.  Would the easiest way be to add an additional voltage source to the LED so the minimum is something greater than 0V? Could that lead to additional problems or potentially damaging anything?
Regarding ldrs: do they typically have a relatively fast response time? For example if I want to change from a large resistance to a smaller one, will the ldr detect the light change quick enough to seem almost instantaneous?

I tried disconnecting the time out and only using the led and ldr to control the delay time. I still have the issue with limited range of usable control from the sliders on the sequencer.  The 8 step program has the ability to decrease the depth of the sliders but no matter which setting I tried nothing seemed to work great. 

Yes. I left the delay pot connected.

I tried a method using an led and ldr.  I connected the tip of my trs cable from the output of the sequencer to the positive side of the led. The negative side of the led is connected to the sleeve of the trs cable. One side of the ldr is connected to pin 6 of the pt2399 and the other side to ground.  The led and ldr are in heat shrink tubing.
The control of the delay time on the sequencer isn't good.  For about 2/3 of the slider control I get no change in delay time. Within the last third of the slider there is still only a portion of it where most of the delay time is changing.  The ldr is from tayda and led is a diffused red.  I may try a different led and ldr combo.  It was tough to tell if the delay time changes happen instantaneously, which is goal, because it was difficult to dial in specific delay times. 
I'm also thinking method may be a little too simplistic.  Looking into other pt2399 circuits with cv, there seem to be much more complex things going on.

Do you happen to have examples of projects that have implemented this method?

I don't need tap tempo. The goal is to use the sliders on the sequencer to set the delay time and have the sequencer cycle through the various settings.

I would like to use my electro harmonic 8 step program to control the delay time of a pt2399 delay? Does anyone know if this is possible or can point me in the right direction?

I'll get a demo up eventually once I have a video and sound recording setup.