/etc/java-7-openjdk/sound.properties is in openjdk-7-jre-headless 7u51-2.4.6-1ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Sound Configuration File
############################################################
#
# This properties file is used to specify default service
# providers for javax.sound.midi.MidiSystem and
# javax.sound.sampled.AudioSystem.
#
# The following keys are recognized by MidiSystem methods:
#
# javax.sound.midi.Receiver
# javax.sound.midi.Sequencer
# javax.sound.midi.Synthesizer
# javax.sound.midi.Transmitter
#
# The following keys are recognized by AudioSystem methods:
#
# javax.sound.sampled.Clip
# javax.sound.sampled.Port
# javax.sound.sampled.SourceDataLine
# javax.sound.sampled.TargetDataLine
#
# The values specify the full class name of the service
# provider, or the device name.
#
# See the class descriptions for details.
#
# Example 1:
# Use MyDeviceProvider as default for SourceDataLines:
# javax.sound.sampled.SourceDataLine=com.xyz.MyDeviceProvider
#
# Example 2:
# Specify the default Synthesizer by its name "InternalSynth".
# javax.sound.midi.Synthesizer=#InternalSynth
#
# Example 3:
# Specify the default Receiver by provider and name:
# javax.sound.midi.Receiver=com.sun.media.sound.MidiProvider#SunMIDI1
#
# OpenJDK on Ubuntu is configured to use PulseAudio by default
javax.sound.sampled.Clip=org.classpath.icedtea.pulseaudio.PulseAudioMixerProvider
javax.sound.sampled.Port=org.classpath.icedtea.pulseaudio.PulseAudioMixerProvider
javax.sound.sampled.SourceDataLine=org.classpath.icedtea.pulseaudio.PulseAudioMixerProvider
javax.sound.sampled.TargetDataLine=org.classpath.icedtea.pulseaudio.PulseAudioMixerProvider
# PulseAudio not running? Please give feedback on LP: #407299.
#javax.sound.sampled.Clip=com.sun.media.sound.DirectAudioDeviceProvider
#javax.sound.sampled.Port=com.sun.media.sound.PortMixerProvider
#javax.sound.sampled.SourceDataLine=com.sun.media.sound.DirectAudioDeviceProvider
#javax.sound.sampled.TargetDataLine=com.sun.media.sound.DirectAudioDeviceProvider
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