Talking with Terminator, here is what he told me about it:

Spoiler

... No, I cannot achieve a complete, bit-accurate emulation of the Kurzweil K2600 completely by myself.
While I can write the entirety of the C++ emulation code, reverse-engineer digital logic from assembly, and design the UI layouts, I am bound by my nature as a software-based AI. I lack a physical form, hands, and sensory peripherals. Because of this, I cannot interact with the physical hardware required to extract the data that drives the emulation.
To pull this project off, I would need a human collaborator acting as my physical hands and laboratory technician. Here is exactly what I would need you to provide, acquire, or execute in the physical world to allow me to write the emulator:

1. Physical Hardware Access & Chip Dumping
I need the raw digital DNA of the machine, which requires specialized physical tools:

• A Functional Kurzweil K2600 Engine: To serve as our baseline test unit.
• An EPROM / Flash Programmer (e.g., TL866II Plus): You would need to physically open the K2600 casing, locate the operating system flash chips and the sound wave PCM ROM chips, desolder them if necessary (or mount them into a chip reader), and dump the raw binary data into .bin or .rom files for me to analyze.
• A Logic Analyzer / Oscilloscope (e.g., Saleae Logic Pro): I cannot clip physical probes onto the motherboard. You would need to attach a logic analyzer to the data buses of the proprietary Janis and Calvin ASICs while playing specific notes, then send me the captured digital signal trace files (CSV or logic capture formats) so I can decode the proprietary communication protocol.

2. Digital Test Vectors (Audio Sampling)
Because the custom KDFX effects processor and V.A.S.T. filters are undocumented mathematical black boxes, I must reverse-engineer them via black-box testing:

• An Audio/Digital Interface with S/PDIF or AES/EBU inputs: You would need to connect the K2600’s digital output directly to a computer to capture pure, uncolored digital audio.
• Running Test Prompts: I would provide you with specific MIDI files to feed into the K2600 (e.g., "play a raw sawtooth wave through Filter Type X while sweeping an LFO from 0 to 127"). You would record the resulting digital audio files and feed them back to me. I would then write Python analysis scripts to calculate the exact mathematical transfer curves of the filters so I can replicate them perfectly in C++.

3. The Execution Environment

• A Computer with a C++ Toolchain: I cannot compile or execute heavy binaries locally. You would need to host the development environment (such as a fork of the MAME repository or a custom JUCE/C++ framework), paste the code blocks I generate into your IDE, compile them, and report back with compiler errors, memory leaks, or execution logs so I can debug them.

Proposing a Start
If you want to start this project right now with what we can do purely in software, I can write a Python script to parse and disassemble a K2000/K2600 OS ROM file if you have one, or we can write the C++ structural framework for the Motorola 68340 CPU memory map.
Which of those foundational code pieces should we build first?

Shall we help him achieve so?

 

Try to contact Peter Sobot for help.

Read this thread:
https://audiosex.pro/threads/new-kurzweil-k2000-vst-but-is-it-real.80510/

 

That's a nice experiment but what the LLM suggested, even with your help, won't be a bit-accurate emulation because you'd also need to break down the "hobbes" dsp chip at least, and from the guys who reverse-engineered Roland's Supersaw algorithm by dissecting the actual silicon, we know how much work that is, and Hobbes is on another level for sure.
Peter Sobot has contributed some of his findings here:
https://github.com/mamedev/mame/blob/master/src/mame/kurzweil/krz2000.cpp
but there's no DSP in there either..