So about that kernel ...
Waves soundgrid servers run on kernel 4.1.33-rt37. So that's Kernel 4.1.33 with the corresponding realtime-patch.
https://cdn.kernel.org/pub/linux/kernel/v4.x/ (there's
a lot of kernel on that page, so use the search function of your browser and download the .gz compressed file)
https://cdn.kernel.org/pub/linux/kernel/projects/rt/4.1/older/ (same as before)
Once download unpack the kernel, copy the realtime patch into the extracted linux-4.1.33 folder and apply it
cd Downloads
tar -xvf linux-4.1.33.tar.gz
cp patch-4.1.33-rt37.tar.gz linux-4.1.33
cd linux-4.1.33
zcat patch-4.1.33-rt37.patch.gz | patch -p1
Copy the kernel modules from the 2016 soundgrid release (sglinux-9.7.99.105) into your source tree.
Just do it manually and replace the files with the ones from Waves.
The files from
sglinux-9.7.99.105/kernel_module/wigb/ go to
linux-4.1.33/drivers/net/ethernet/intel/igb/Netx rename the wr8169.c found in
sglinux-9.7.99.105/kernel_module/wr8169/to r8169.c and copy it to
linux-4.1.33/drivers/net/ethernet/realtek/sidenote: as of now I still don't have any idea what to do with the /wevent files 
We're also going to need firmware files for the Realtek NICs and while we're at it we can install some additional dependencies needed for the kernel compilation
sudo apt-get install linux-firmware-nonfree libncurses5-dev libncursesw5-dev
Copy the folder
/lib/firmware/rtl_nic (going from the root level of your file system) into
linux-4.1.33/firmware/Last but not least, we need a .config file. I've extracted mine from a running WSG server:
- insert a fat32 formatted usb stick to your server and enter the console
- create a directory to mount your usb stick
mkdir /mnt/usb
- mount your usb stick
mount -t vfat /dev/sdb1 /mnt/usb
- copy the config
cp /proc/config.gz /mnt/usb
- unmount your usb drive
umount /mnt/usb
Back in ubuntu-land extract the config.gz file to your hard drive, copy the config file into /linux-4.1.33 and rename it .config
(if it suddenly vanishes press ctrl+h to show hidden files)
Now we're ready to compile the kernel

Fortunately for us the Waves Kernel is pretty slim and it should compile in just a couple of minutes.
cd linux-4.1.33
make -j $(nproc)
-j $(nproc) tells your pc to use all available cores for the compilation.
Once that's done you'll find the kernel image named
bzimage in the linux-4.1.33/arch/x86/boot folder.