Or are you building your own effects pedal from scratch and want to add storing and recall capability to it?
Yes. I'm just trying to add preset capability to anything in the future. I've not experience with digital pot's so I'm looking forward to learning.
The dual-gang pot's are for stereo volume or tone.
Just for reference; what is the largest value digital pot' that can be purchased?
Regards,
K
Funny 
Adding preset capability to "something in the future" cannot be answered, as the integration solution will be unique for whatever you are adding it to.
The solution I used, meaning digital potentiometers with analog pots connected to an Arduino, worked for me but I had to solve for the power supply issue.
Whatever you are adding it to will need to be understood fully. You can't just throw any digital pot on any circuit and have it work. You have to match the solution to the specific device you are modifying.
As one example ... Sometimes a pot on a piece of analog gear is carrying an audio signal, sometimes it is just a control reference signal. Sometimes it is 5v, other times 9v, other times less than 2v, some even carry 18v, etc ...
Creating a solution which can be applied to any piece of gear has been tried in the past, but was tried with motorized pots which clamp over the top of the OEM analog pots. I want to say this was tried back in the 70s with old school amp heads. It's not reliable though, and fairly expensive and cumbersome to create.
Doing it with digital potentiometers is a more stable and streamline way to do it, but it has to be customized for the particular piece of gear you are wanting to modify.
So if you're looking to design something which can be used on any piece of gear, to add preset save and recall ... it's not really possible unless you try the motorized solution.
OP is looking for someone to design it for them but can't describe what it is they want designed.
What makes you think that? I spend hours at the computer trying to learn! I can't help the fact that I'm not great at explaining something that's is somewhat alien to me... Yes language barrier, indeed. I honestly like collaborating with people, but things like this aren't very productive. If you don't mind, I'd like to keep up with the task in hand, and hopefully people will be able use it in the future. The guidance so far is already additional to the original project, so I'm actually glad Stoopalini stooped in with his knowledge. Thanks for that.
The pot's mentioned aren't concentric.
1 x 100K - Dual Gang (Filter)
1 x 100K (Sustain)
1 x 20K (Mid)
1 x 10K (Volume)
1 x 100K (Master Volume)
1 x 500K (Gain)
In the meantime, check this out if you've not seen it
https://zaardvark.blogspot.com/2016/05/ehx-pitch-fork-remote-control_22.html
Thanks again,
K
It's not clear how those pots are connected in your design. Can you draw a better schematic?
The link you posted doesn't bear any relevance to your project description. Is it a new project?
Like I said K, the value of the analog pot is important, but so is how it is integrated into the existing circuit and what kid of signal is passing through it.
As you can see from the link I posted above, there are all sorts of digital potentiometers available. There's much more than just overall resistance value to consider.
You should post a picture of the device you want to modify, external and internal photos, as well as take a shot at drafting up a diagram of how you think you might be able to interface with it.
It's ok to not know the answers, but start somewhere. Pictures and a diagram will help others understand what you are wanting and provide a mechanism for them to give you some input.
it looks like, at a minimum, you'll have to disconnect the wiper of the hardware pot and connect in its place the wiper from the digital pot.
Or theoretically the value of the hardware pot doesn't matter so much as the voltage on its wiper so you don't need that wide range of pot values, just a way to switch the wiper between the two sources.
Of course, figuring that out would require you to do the things that @Stoopalini has suggested. The way you have presented the problem so far will require lots and lots of digital pots whereas if you would contribute to the process a little bit, someone might have some better ideas.
Added:
You have refused to answer simple questions like in post #6 so it's no wonder people are reluctant to help you.
For example, the FC-7 pedal on my KX-88 has two 50K pots wired like rheostats, so if I wanted presets for that, I would use some number of digipots wired like the second example with a suitable switch or relay to enable the function.
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