Most plugins cope just fine with setting up junctions (I use Link Shell Extension) from a real preset folder to the place where they look for (often in c:\ProgramData somewhere).
This is how I have most of my presets in my D:\UserFiles\Presets folder, which is auto-synced to my pCloud.
There are some plugins that don't like this though, and those I manually copy the files around.
I surely agree with giving ASIO4ALL a shot (go into the advanced settings and experiment with the buffer sliders). As for a DAW, I sincerely recommend you try Mulab - you can just download the free version and see how that works for you. Good luck!
First of all, you will need your keyboard to act as a USB soundcard if you want to get the sound from the computer through it. The M1 in this case has nothing to do with that. As I can see from the Korg specs page, it does not look like it has USB audio so you cannot play the computer sound through your keyboard.
Second, only as a heads up, the fact that the Korg M1 can be played standalone (without a DAW) is not usual (several digital synths do not have a standalone version), and when running standalone they are not called VSTs: they are VSTs when they are in the form of a .dll and can be opened only from a DAW.
From there, to reduce the audio latency (lag) of the M1 you can do two things. For both ones you should get an ASIO driver for your computer. Assuming you use Windows and that you do not have a soundcard, install ASIO4ALL. This is an audio driver which works for almost any soundcard (integrated too) and provides less latency than the regular Windows driver.
Then you have the two options: Run Korg M1 as standalone and look for an option to change the audio driver to ASIO4ALL, then reduce the buffer size until you get a low latency but no overruns, or use a DAW like Reaper to run M1 as a plugin and also select ASIO4ALL as the audio driver, reducing the buffer size too.
Information on Stagelight can be accessed here http://us.openlabs.com/stagelight/ The Stagelight Android download and information is here https://play.google.com/store/apps/details?id=com.openlabs.stagelight&hl=en
I'd recommend Helm. It's a free, open-source synth with great visualizations and it's pretty lightweight. Been using it for a while now. The only downside is that there are no panning options. But other than that it's pretty great! https://tytel.org/helm/
Probably not much help to you but it's working perfectly for me in Cubase 11.
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Have you got the most recent version ?
I'm in love with Tracktion's plugin bundle. It's a great set, lightweight and goes on sale often.
https://www.tracktion.com/products/daw-essentials-collection
It's not a perfect solution as it involves using another DAW, but if you grab Cakewalk, you get to use TH3 which is kind of a little bit insane. For the price of 'nothing' at least.
You shouldn't need JACK in Windows 10, only Linux. As far as Musescore, are you trying to export something you composed in it into LMMS? If you're trying to export: https://musescore.org/en/handbook/saveexportprint
Finally having more than one drive is becoming normal. I use three drives myself. I like that I have a d:/VST folder.
I backup all my stuff using resilio which allows my to save them to my small home server and to my laptop. I highly recommend it for content creators. It is the most flexible and just works system I have ever used.
Didn't think there was a mapped set of samples i could edit without having to re-map (and I don't have an editor for gigasamplers/sampletank).
Turns out I was wrong. Didn't know I could play sfz files in a free VST on OSX Lion.
If it helps anybody else: here's a reversed piano .sfz I made, based on Sonatina Symphonic Orchestra (http://sso.mattiaswestlund.net/). I guess it's also under a Creative Commons license.
https://www.dropbox.com/s/s4afw4wby9ne37o/soundfont.zip
Samples reversed and silence trimmed from the beginning. Still really long attack, obviously.
There's a few Flowstone developers that might be interested, if the idea hasn't been explored already. Why not do some searching/reading here and see if anything looks familiar, or if a particular dev seems like they might be copacetic with your thinking.