Multiple fadeIn/fadeOut effects in one audio file with ffmpeg -

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I have a problem adding several feed effects to an audio file i when I try to use an order like this I: 

  ffmpeg -y -i /home/user/video/test/sound.mp3 -af "afade = t = in: ss = 0: d = 3, afade = t = St = 7: d = 3, afade = t = in: cents = 10: d = 3, afade = t = out: cents = 17: d = 3, afade = t = in: st = 20: d = Then, my output audio file  feedin  and   Feedout  Not all the next applied effects are applied once Is there any possible way to implement many fade effects to the audio file are not? Also, what is the difference between the  ss  and  st  parameters in this command?   
 
 
 Take a look here:  
  quantity = 'if (lieutenant (T, 10), 1, Max (1- (T-10) / 5,0): 'Eval = frame   
 Full command:  
  ffmpeg -i movie.wav -filter volume = 'if (lieutenant (t, 10), 1, max (1- (t-10) / 5,0):' eval = frame revised-movie. Code>

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