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Can you elaborate on what the values in this line are? Are these the MIDI CCs that are sent if a custom function (e.g. tempo, chord) is disabled?

byte midiCcNumbers[7] = {1, 2, 3, 7, 10, 11, 12};

Two options: a guitar with MIDI output, or converting the guitar audio to MIDI

The first option is a guitar with a MIDI pickup. This is usually expensive and varies in performance. I have a Roland GK kit with a GI-20.. pretty old stuff, and it is not totally reliable. You have to play very deliberately and it does not do legato/bends reliably. You have to hit notes pretty hard to get them to come through reliably. Newer hardware is probably more reliable. I would be willing to bet that Aethernaut uses a violin with MIDI hardware built-in.

The second option is trying to use software to convert audio to MIDI. This also suffers from reliability issues, though honestly I haven't tried any software for this in at least 8 years.. it might have come a long way since then.
If you're going for something that will work in real-time, LSDJ probably isn't your best option as you'll have no control over dynamics... it won't matter if you play notes louder or quieter, they'll all come out of the GB at the same volume. mGB would probably be more reliable but lacks in some sound options.
Either way you'll need an Arduinoboy to get the MIDI into the Game Boy.

add to 'advantages'
>extremely fine-grain control over sounds and individual notes.

For example, lets say you have a plunky, piano-like sound. Quick attack, quick decay, long release, no portamento.

BUT for just this one part you want this note to fade in, then slide up to this note, then vibrato, the pitch bend down quickly. You want the next few notes to have a filter (or PWM) envelope, a longer decay with a quick arp sequence applied to them.

In MIDI, this would be a considerable amount of automation, possibly multiple instruments needed.

In a tracker, it's just a few commands in a column and one table.

Ahh just found my issue... I think I was trying to use N00 instead K00 to end the notes using chords.
Do you think it would be possible for chords to kill with N00? I've been trying to use NOI as a external drum sequencer as well as retaining the original NOI sounds. Using N00 would enable the MIDI notes to be killed without cutting of a longer NOI sound.

In BGB, the .sav automatically loads based on filename of the ROM.

For example, if your LSDJ rom is named 'lsdj494.gb', you rename your .sav file to 'lsdj494.sav'. As long as they have the same name and are in the same folder, BGB will load the .sav automatically.

If you are using multiple .sav files this can become cumbersome; I overcome this by creating multiple copies of the .gb file.
For example, I refer to my two cartridges as 'Orange' and 'Black' due to the color of the LSDJ sticker on them.
So I have two copies of the same LSDJ ROM, lsdjblack.gb and lsdjorange.gb. I keep my .savs in a different folder, then drag them my BGB folder then rename them to match the .gb file.

There's probably other ways of doing it but this is my method. I believe VBA has an option to import a battery save, but for chiptune purposes you're going to want BGB.

short answer: no

long answer: the only (current) way to send MIDI from LSDJ is Arduinoboy, which is of course a hardware device. KiGB does support link cable emulation, but that means that you would either have to
1) convert the TCP/IP output to a hardware link cable and use a real Arduinoboy, then send the MIDI back in. This would probably require 2 arduinos and coding the conversion yourself,  OR
2) figuring out how to emulate Arduinoboy on the computer, which I haven't heard of anyone doing yet. Probably because it would introduce too much latency, and have an river of bugs to swim through to get it working well

excellent work