Amplitude and Frequency Vibrato

The following files play a 440Hz sine wave with varying AM frequencies (100% modulation). 

AM frequency = 1
5
10

The following files play a 440Hz sine wave with varying % of modulation of a 5Hz AM. 

% modulation 100
50
25

The following files play a 440Hz sine wave with varying FM frequencies. 

FM frequency = 1
5
10