Added Audio Driver Notes

dial_tone/README.md

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+# dial_tone - USB Audio Player for GL-XE300
+
+## ALSA Userland Tools
+
+These give you the aplay, alsamixer, and basic testing commands.
+
+opkg install alsa-utils
+
+aplay – play WAV files
+alsamixer – mixer for volume control (if supported)
+speaker-test – generate test tones
+
+## Kernel Modules for Audio Support
+
+These allow the kernel to actually see and use the USB audio device:
+
+opkg install kmod-sound-core
+opkg install kmod-usb-audio
+
+Make sure both were installed — they enable:
+
+ALSA sound subsystem (snd)
+USB audio class driver (snd-usb-audio)
+
+Check module status:
+
+lsmod | grep snd
+
+## Other Notes
+
+opkg install usbutils
+
+lsusb           
+lsusb -v        
+
+Assuming your files live in /root/wav/:
+
+WAV (Raw PCM):
+aplay --buffer-time=200000 --period-time=10000 -D plughw:0,0 /root/wav/test.wav
+
+MP3:
+mpg123 -a plughw:0,0 /root/wav/test.mp3
+
+## Install Commands
+
+```bash
+opkg update && opkg install alsa-utils kmod-sound-core kmod-usb-audio mpg123 madplay timidity usbutils
+
+