Windows 7 uses echo cancellation, autogain and other audio enhancement tools built into the operating system.
However, these often have a negative effect on the behavior when used in music lessons with doozzoo.
These Windows internal settings lead to ducking effects and may prevent the playback of
internal sounds like metronomes and audio players in doozzoo.
In the attached screenshots you can see the settings in Win7
1. right mouse button > toolbar > sound icon >
a). Playback > Loudspeaker > Properties > Extensions > Disable all
b) Communication > Do nothing