The sound input from a microphone is output from a speaker. Check device : BSHSAU01BK

Dependencies:   USBHostDac USBHost_custom_Addiso

Revision:
2:0b9331cde97b
diff -r 6f8a2257cc18 -r 0b9331cde97b mbed-os.lib
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-os.lib	Mon Apr 24 12:45:14 2017 +0900
@@ -0,0 +1,1 @@
+https://github.com/ARMmbed/mbed-os/#42be5c01a7f91292d5e27124ad9584236025f6ab