This README describes the audio assets, and how they relate to each other.

The product .mk references one of the AudioPackage*.mk, which installs the appropriate assets into the destination directory.

For UI sound effects, frameworks/base/media/java/android/media/AudioService.java array SOUND_EFFECT_FILES contains a hard-coded list of asset filenames, stored in directory SOUND_EFFECTS_PATH.

Touch sounds

effects/Effect_Tick.ogg old, referenced by AudioPackage[2345].mk OriginalAudio.mk

effects/ogg/Effect_Tick.ogg new, referenced by AudioPackage[6789].mk AudioPackage7alt.mk AudioPackage10.mk

effects/ogg/Effect_Tick_48k.ogg oggdec -o temp.wav ogg/Effect_Tick.ogg sox temp.wav -r 48000 temp48k.wav oggenc -b 80 -o ogg/Effect_Tick_48k.ogg temp48k.wav

effects/wav/Effect_Tick.wav does not appear to be related to the other files in any obvious way

Video recording

./effects/ogg/VideoStop_48k.ogg unused

NFC

./effects/ogg/NFCFailure.ogg ./effects/ogg/NFCInitiated.ogg ./effects/ogg/NFCSuccess.ogg ./effects/ogg/NFCTransferComplete.ogg ./effects/ogg/NFCTransferInitiated.ogg

referenced in AudioPackage14.mk (= AudioPackage13.mk + NFC sounds).