The setup for doing this is a little complicated, because three different setup operations have to take place:

• The Windows Subsystem for Linux feature needs to be installed and configured with an appropriate Linux distribution. WSL2 should be used -- it's apparently a big improvement over the original WSL. I don't know if these instructions will work for the earlier WSL.
  
  
• The RTcmix standalone needs to be configured and compiled. A number of packages for Linux will have to be installed to allow this.
  
  
• An audio server needs to be established in Windows and then addressed from Linux to enable real-time audio 'in' the WSL2 environment.

Follow the directions in this page to install the WSL2 package:

	https://docs.microsoft.com/en-us/windows/wsl/install-win10

	sudo apt update

I like tcsh as my shell, but when I typed it in my Linux terminal I got:

	Command 'tcsh' not found, but can be installed with:
	sudo apt install tcsh

	chsh -s /usr/bin/tcsh brad

Next I had to install a set of packages that would allow me to build RTcmix on Ubuntu:

	sudo apt install build-essential
	sudo apt install flex
	sudo apt install bison
	sudo apt install pmidi
	sudo apt install alsa
	sudo apt install libasound2-dev

Once you have unpacked the RTcmix archive, go into the top-level RTcmix folder and type:

	./configure --with-alsa

1. Go into the RTcmix/src/control directory and edit the Makefile. Line 4 should say:

	DIRS = common midi mouse display datafile pfbus

Change it to:

	DIRS = common midi pfbus


2. Go into the RTcmix/src/audio drectory and edit the file "ALSAaudiodevice.cpp". The function ALSAAudioDevice::run() (around line 418) has this code:

	void ALSAAudioDevice::run()
	{
	   PRINT0("ALSAAudioDevice::run: top of loop\n");
	   int ret;
	   while ((ret = waitForDevice(isPlaying() ? 0 : 1000)) == 0) {
	      if (runCallback() != true) {
	         break;
	   }
	}

Change it to this:

	void ALSAAudioDevice::run()
	{
	   PRINT0("ALSAAudioDevice::run: top of loop\n");
	   int ret;
	   while (1) {
	      if (runCallback() != true) {
	         break;
	   }
	}


3. In that same file, the function "ALSAAudioDevice::recognize(const char *desc)" (around line 444) should say:

	bool ALSAAudioDevice::recognize(const char *desc)
	{
	   return desc == NULL
	      || strncmp(desc, "hw:", 3) == 0
	      || strncmp(desc, "plug", 4) == 0;
	}

Change it to this:

	bool ALSAAudioDevice::recognize(const char *desc)
	{
	   return desc == NULL
	      || strncmp(desc, "hw:", 3) == 0
	      || strncmp(desc, "plug", 4) == 0
	      || strncmp(desc, "pulse", 5) == 0;
	}

	make
	make install

	set_option("play = 0")

	rsetparams(44100, 2)
	load("WAVETABLE")

	rtoutput("outputsound.aif")

	WAVETABLE(0, 7, 20000, 8.00, 0.5)

	https://www.freedesktop.org/wiki/Software/PulseAudio/Ports/Windows/Support/

	#load-module module-native-protocol-tcp

	load-module module-native-protocol-tcp auth-anonymous=1

Be sure to get rid of the "#" at the beginning of the line.


3. Also in that "pulseaudio-1.1/etc/pulse" directory, edit the file "daemon.conf" (it used to be called "daemon.pa"), and change the line (around line 39):

	; exit-idle-time = 20

	exit-idle-time = -1

Be sure to get rid of the ";" at the beginning of the line.


4. You can now start the Windows pulseaudio server. Go into the "pulseaudio-1.1/bin" directory and (from Windows) start up the "pulseaudio.exe" file. You should see a command-window start up (you may have to launch the "pulseaudio.exe" file several times). This window may say things like:

	W: [(null)] pulsecore/core-util.c: Secure directory creation not supported on Win32.
	W: [(null)] pulsecore/core-util.c: Secure directory creation not supported on Win32.
	W: [(null)] pulsecore/core-util.c: Secure directory creation not supported on Win32.
	W: [(null)] pulsecore/core.c: failed to allocate shared memory pool. Falling back to a normal memory pool.
	W: [(null)] pulsecore/core-util.c: Secure directory creation not supported on Win32.
	W: [(null)] pulsecore/core-util.c: Secure directory creation not supported on Win32.
	W: [(null)] pulsecore/core-util.c: Secure directory creation not supported on Win32.
	E: [(null)] daemon/main.c: Failed to load directory.

	sudo apt install pulseaudio-utils

	export PULSE_SERVER=tcp:$(grep nameserver /etc/resolv.conf | awk '{ print $2 }')

	setenv PULSE_SERVER  `grep nameserver /etc/resolv.conf | awk '{ print "tcp:"$2 }'`

	nc -vz $(grep nameserver /etc/resolv.conf | awk '{print $2}') 4713

	nc -vz `grep nameserver /etc/resolv.conf | awk ' { print $2 } '`  4713

	pcm.!default {
	   type pulse
	   # If defaults.namehint.showall is set to off in alsa.conf, then this is
	   # necessary to make this pcm show up in the list returned by
	   # snd_device_name_hint or aplay -L
	   hint.description "Default Audio Device"
	}
	ctl.!default {
	   type pulse
	}

	aplay somesoundfile.wav

	play -D pulse somesoundfile.wav
	play -D pulse somesoundfile.aif
	CMIX -D pulse < somescorefile.sco