Update readme.

Author: jasonporritt

README.md

@@ -7,12 +7,14 @@ This setup should work for a variety of rg351 devices, including the rg351m, rg3
 3. Put the SD card in your device and boot it up
 4. Under Ports you should now see an m8 item with a few scripts
   - SETUP - will install libserialport and add your user to the proper group to interact with serial devices.
-  - M8 - launches m8c
+  - M8 - launches m8c (uses alsaloop for audio)
+  - SETUP_PULSE - installs pulseaudio if you prefer that audio subsystem
+  - M8_PULSE - run m8c using pulseaudio
   - _setup_build_tools.sh - install headers and build tools for compiling m8c
   - _build_m8c.sh - build the binary
 5. Connect your device to the internet (Wifi dongle or built-in wifi). It's required for SETUP so that packages can be installed, but not for running m8c itself.
-6. Run the SETUP task and then reboot the device to ensure the user group changes take effect
-7. Now try running M8. If you're lucky it'll all work!
+6. Run the SETUP or SETUP_PULSE task and then reboot the device to ensure the user group changes take effect
+7. Now try running M8 or M8_PULSE. If you're lucky it'll all work!
 
 ## Building
 
@@ -22,4 +24,18 @@ You can run the `_setup_build_tools.sh` and `_build_m8c.sh` scripts to rebuild m
 
 ### No audio
 
-Check alsamixer settings.
+The pulseaudio setup uses device numbers to avoid needing to look up device names. It has worked consistently for me but you may need to use different device numbers or names depending on your setup. You can see device names and numbers using these commands:
+
+- sudo pulseaudio --start &
+- sudo pacmd list-sources | grep -e 'name:' -e 'index:' -e device.string
+- sudo pacmd list-sinks | grep -e 'name:' -e 'index:'
+
+Also check alsamixer settings. You may have a device muted or set to low volume.
+
+### Audio glitches
+
+If the alsaloop setup (default) has audio glitches or crashes, you can use the pulseaudio variant of the commands.
+
+- Connect your device to the internet
+- Run the setup_pulse script
+- Then you can run the M8_pulse script to run M8 using the pulseaudio subsystem