Kind of a newbie to electronics, but I had a quick learning curve. I am trying to use a Linearized Voltage Controlled Resistor to make a modulative potentiometer controlled through a self made DAHDSR envelope of max. 5v output, but I have no idea how to make one all I could find online were specific applications of it, and mostly non-linearized at that. I understand the basics of JFETs and a little bit of the advanced applications for them, but I can't quite understand how they work in this specific circuit. Can anyone help?
For starters, please clearly identify the part and post a link to the product page or data sheet.
It's not a part, it's a circuit that uses JFETs. That's about all I know about Variable Controlled Resistors.
Edit: Made a mistake and used JFET twice! Whoops!
Forum members might be inclined to offer suggestions if you posted the actual circuit with all parts and connections clearly identified and labeled.
By the way, you can buy self contained, voltage or digitally controlled electronic potentiometers.
All I have found online is about digital potentiometers that use a digital signal, not anything that uses an analog voltage signal for input. I have diagrams, but they are all hand drawn as I find CAD software hard to use. I could try putting together a diagram on KiCAD, but it will be missing the main part which is the VRC.
We welcome those drawings, as long as all parts and connections are clearly labeled. Post a pic.
Voltage controlled resistors or potentiometers have been around for decades, but they are no longer popular because it is so much easier and cheaper to generate a digital control signal than a voltage control signal.
Seems interesting, but that's an exponential curve instead of a linear function.
I feel like I'm too far deep into this project to restart and use digital instead of analog. I started this project just to try and add on to my learning, and I'm determined to keep using analog signals and only use digital when I absolutely have to. I'll post diagrams as soon as I can.
You have a bit left to learn, it seems. Have fun!
I do, never said anything about being an overnight genius, just that I know enough to start and perhaps finish this project!
Correct. That is why the fet is used in a circuit...
So that you use only a small part of the curve.
Or have something like feedback to make the circuit behave like linear...
Or convert the input to the inverse of reciprocal...
Please post... Hand drawn is fine ad long as pin and component labels are included.
Tom.... 
MOSFETs have a linear/ohmic region where they behave as voltage-controlled resistors.
IAN50006 - Power MOSFETs in linear mode | Nexperia
Usually it's a problem on this forum due to people not applying enough voltage to fully turn on the FET, but in this case you can use it to your advantage.
A Voltage-Controlled Resistor (VCR) is a circuit that changes resistance based on a control voltage. Using a JFET, you can make a variable resistor whose resistance is modulated by the gate voltage.
However, JFETs are inherently nonlinear. Their drain-source resistance (R_DS) is only roughly linear in a narrow range when the device is in the ohmic region (i.e., when V_DS is small and V_GS controls resistance).
To linearize this behavior, you need to:
Keep the drain-source voltage small
Control the gate-source voltage accurately
Use feedback or a specific circuit design that compensates for nonlinearity
Thank you for this diagram, I was looking for a linear compensation circuit.
Edit: what Op-amps should I use for it? And what resistor values do I need for a 0-5v range?
In my search for a VCR, I realized that I have another problem. I am going to have multiple input modulations (sometimes even 16 at a time) to the VCRs. How do I go about this? Again, same 5v max. output, 1v min. output.
There are many you could use, it is a trade off between affordability and performance. Basically you need what is known as a "rail to rail" operational amplifier. That is one that is capable of outputting a voltage very close to the power supply rails.
The resistors are almost irrelevant to the range so in the range 1 to 10K should be fine. All except the one on pin 2 of the IL300. That controls the current into the LED, and should be sized to make sure you are not passing too much current. Bare in mind the output of what ever operation amplifier you end up using might not have the output current capacity to drive the LED.
Simply repeat this circuit as many times as you need. There are no short cuts for this as all the VCRs have their own individual characteristics.