Thank you, you helped me .
But one more question on the same topic - transcode to mono WAV- format mode failed, so I had to use OGG. What are the risks ?
Explain the problem with WAV - output file weighs as much as his stereo original, standard players played normally. But when loaded into the game using SFML problems - no sound is played . About him , all the information up to the number of channels and the size , but the sound can not be played . The same thing happens if the file encode WAV- format in stereo mode ( surprising, but this file , in ideas , in no way should be different from the original, but weighs twice as much and also can not be played means SFML).