How was the JMP-1 Modeled?

R

rrhoads17

Inspired
I spoke to someone from another company who makes modeling devices and asked them if they could add the JMP-1 model. They replied and said that the JMP-1 isn’t really possible to model very accurately since it’s a “hybrid preamp” so to speak. I found that odd since Fractal and Nembrini have created a model of it. So how did Fractal do it? The model must be fairly accurate if Def Leppard and Iron Maiden are using it now.
 
I saw a comment from St Rock saying their tech wasn't really geared towards modelling solid state, I think they mentioned modelling a Valvestate wouldn't really be easy for them.

The Valvestate is a lot like the JMP-1, the valve in the circuit is basically just buffering/driving the tone stack, and it isn't being overdriven. Nothing stopping anyone modelling those pieces of gear, it just may take a different approach to what a company normally does (or specialises in)
 
rrhoads17 said:
I spoke to someone from another company who makes modeling devices and asked them if they could add the JMP-1 model. They replied and said that the JMP-1 isn’t really possible to model very accurately since it’s a “hybrid preamp” so to speak. I found that odd since Fractal and Nembrini have created a model of it. So how did Fractal do it? The model must be fairly accurate if Def Leppard and Iron Maiden are using it now.
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Not possible to model because it's a "hybrid preamp". Huh? It's just a preamp. Basically the same as a JCM 900 pre.
 
The real question is was it a 90s lazer background, green screen, black sheet or white sheet?
 
Let me preface this with I am a Software Engineer who dabbled in created an amp modelling plugin, and I read a lot of research papers on amp modelling techniques. I spend a lot of my time explaining why it's so difficult to change the color of a button.

If you can model a tubescreamer, which is one of the examples that pops up a lot as a simple thing to model, you can model solid state.

The State of the Art component modeling technique is to run a simulation of every component on the circuit e.g. SPICE.

From what I understand, none of the major players model the entire circuit at once, they break it up. For example pre amp, tone stack, power amp, etc. This way they can reuse the same modeling code, but change the component values to match the amp. (Which is were I gave up because I don't have an actual amp or the tools or expertise to measure one).

My educated guess to OPs problem: The developer didn't plan for multiple preamps so they are limited to 1 preamp with different parameters for each amp. Changing that would mean refactoring the whole codebase which is a no go for a small company.

Coding is the easy part of software engineer.
 
Greg Ferguson said:
Cliff did one better than that, he developed a whole new “SPICE” that runs circles around the standard code…
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No one actually uses the program SPICE to do the simulation. Even the fastest computer couldn't run a simple single tube circuit in real time. I used SPICE because it's synonymous with circuit simulation.

Some companies say they do "component level modeling" but are just using wave shapers, eq, and compression. And you can tell.

To remain competitive in component level amp modeling, you would have to write your own fast and efficient circuit sim. All the major players do it (Fractal, Line 6, NDSP, and probably a bunch more). Some (Fractal) just do it way better than others.
 
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