If your SONAR application suddenly stops producing audio while in the midst of recording or playback, you've very likely experienced a "dropout." Sometimes instead of a dropout, you may experience a "stutter" during playback (a small section of audio repeats itself once or twice before normal playback resumes). Or, you may occasionally experience a "glitch" or "pop" during audio playback (a brief interruption or clicking noise is heard, but audio playback then continues normally from that point). It is possible to experience a dropout while working exclusively with MIDI (i.e., no audio data in the project), but this is a different matter and is not covered here.