Which audio player allows me to change the playback rate?

Question

Are there audio player for Linux, that can play audio with some coefficient, that I can manually change, something like x0.5, x0.7, x0.79, 1.0 - normal, x1.5 etc...

Answer 1

Assuming that you mean the playback rate, VLC media player supports vlc.input.rate:

input speed given as float (1.0 for normal speed, 0.5 for half speed, 2.0 for twice as fast, etc.)

Answer 2

Good old Mplayer/Mencoder will do the job:

  -speed <0.01-100>
          Slow  down or speed up playback by the factor given as parameter.  Not guaranteed to work correctly with
          -oac copy.

Tested it with:

mplayer -speed 0.07 01\ -Highway\ To\ Hell.mp3