How to change the sound in MuseScore 2.
Step 1: Change the Sound
Go to the folder in which you installed MuseScore, which will likely be %ProgramFiles(x86)%\MuseScore 2.
Then download your other sound, either by downloading MuseScore 1's old sound or getting something different.
Drag your new sound into the MuseScore 2\sound folder, and close everything. Open MuseScore 2.
Click on View > Synthesizer. Click "Add" located in the botttom right corner of the soundfont viewer.
Select your new sound and click the confirmation button.
Select your sound and click "Set as Default".