Add note on USB output devices
This explains how to allow Mycroft to use the system default device instead of forcing the use of device index 0.
@@ -93,6 +93,27 @@ _NOTE: We do not gain any profit or benefit from the links below, they are provi
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| Speaker | Logitech Z50 | United States [Amazon.com](https://www.amazon.com/Z50-smartphone-tablet-laptop-Grey-x/dp/B00EZ9XLF8), Australia - [Good Guys](https://www.thegoodguys.com.au/logitech-computer-speaker-z50-blue-2453262 ), United Kingdom [Amazon.co.uk](https://www.amazon.co.uk/Logitech-Z50-Speaker-Ocean-Blue/dp/B00FSF2ODS ) | |
+### A note on USB speaker/headphones/soundcards
+
+If mycroft audio output fails (No speech or audio) when using some sort of USB soundcard for output it might be worth trying to reset the play commandlines used by mycroft.
+
+To accomplish this, edit `/home/pi/.mycroft/mycroft.conf` and insert
+
+```
+ "play_wav_cmdline": "aplay %1",
+ "play_mp3_cmdline": "mpg123 %1",
+```
+
+If no other edits has been applied to the file it should look something like
+
+```json
+{
+ "max_allowed_core_version": 18.8,
+ "play_wav_cmdline": "aplay %1",
+ "play_mp3_cmdline": "mpg123 %1",
+}
+```
+
## Getting started with Picroft
### Downloading the disk image
