Amplitude and Frequency Vibrato

• Amplitude vibrato is amplitude modulation (AM) in which the loudness fluctuates with a frequency of 1 to 10Hz.
• Frequency vibrato is frequency modulation (FM) in which the pitch fluctuates with a frequency of 1 to 10Hz. 

This demonstration was created by Dan Boye using the Java2 sound interface written by Todor Penev.