You need to provide a LOT more info before anyone can even TRY to help.
What operating system is your computer using? What version of MuseScore are you running? (Help / About MuseScore) When does this happen? To all instruments in a particular score? To a particular instrument in any score? Provide a score that the problem happens.
According to posts I've seen here in the forums, this issue is usually a problem of the sound settings on your computer and in MuseScore, but without that additional information, no one can even begin to guess.
Comments
You need to provide a LOT more info before anyone can even TRY to help.
What operating system is your computer using? What version of MuseScore are you running? (Help / About MuseScore) When does this happen? To all instruments in a particular score? To a particular instrument in any score? Provide a score that the problem happens.
According to posts I've seen here in the forums, this issue is usually a problem of the sound settings on your computer and in MuseScore, but without that additional information, no one can even begin to guess.