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You just have to check the whitepaper:
Read more there,you have to adjust those depending on where you are.
Microphone noise suppression is an option of reducing the background noise,for example when you are in the street.
Speaker voice enhancement will make the calling experience richer.
Slow talk will make the other person sound really slow.
Name some and I will try to help.
Sound enhancement - equaliser for walkman
xLOUD - rises the loudness of internal speaker
Clear Phase - will adjust automatically the sound quality of the internal speaker
Clear stereo - headphone setting which will adjust the right and left channels to get stereo sound
Dynamic normaliser - minimize volume differences between songs or videos
Clear Audio+ - will optimize settings for listening to music

Loudspeaker.I am not sure I gave the best description for sound enhancements,it is kind of an equalizer for walkman.