Add some more details to the fsync instructions

It's worth mentioning that you should build wine-tkg yourself because
some people seem to install the binary releases instead, and even though
I haven't heard it cause any problems for anyone it's also good to be
aware that you need the `-dkms` versions of any extramodule packages if
you're using `linux-zen` (or any other custom kernel).

README.md

@@ -695,17 +695,23 @@ negative side effects:
   spikes.
 
 - The last but perhaps the most important thing you can do is to use a build of
-  Wine compiled with Proton's fsync patches. This can improve performance
-  significantly when using certain plugins. If you're running Arch or Manjaro,
-  then you can use [Tk-Glitch's Wine
+  Wine compiled with Proton's fsync or FUTEX2 patches. This can improve
+  performance significantly when using certain multithreaded plugins. If you are
+  running Arch or Manjaro, then you can use [Tk-Glitch's Wine
   fork](https://github.com/Frogging-Family/wine-tkg-git) for a customizable
-  version of Wine with the fsync patches included. Aside from a patched copy of
-  Wine you'll also need a supported kernel for this to work. Manjaro's kernel
-  supports fsync out of the box, and on Arch you can use the `linux-zen` kernel.
-  Finally, you'll have to set the `WINEFSYNC` environment variable to `1` to
-  enable fsync. See the [environment configuration](#environment-configuration)
-  section below for more information on where to set this environment variable
-  so that it gets picked up when you start your DAW.
+  version of Wine with the fsync patches included. Make sure to follow the
+  instructions in the readme and don't try to use the prebuilt releases as they
+  will have fshack enabled which tends to break many plugins that use Direct3D
+  for their rendering. Aside from a patched copy of Wine you'll also need a
+  supported kernel for this to work. Manjaro's kernel supports fsync out of the
+  box. On Arch you can use the `linux-zen` kernel. If you're installing
+  `linux-zen` and you also use extramodules like NVIDIA drivers or VirtualBox
+  host modules, then you'll need to also install `linux-zen-headers` and the
+  `-dkms` versions of those extramodule packages. Finally, you'll have to set
+  the `WINEFSYNC` environment variable to `1` to enable fsync. See the
+  [environment configuration](#environment-configuration) section below for more
+  information on where to set this environment variable so that it gets picked
+  up when you start your DAW.
 
   You can find a guide to setting these things up on Ubuntu
   [here](https://zezic.github.io/yabridge-benchmark/).