4.2

The number of bits in each audio sample. The
higher the bit rate, the larger the potential
dynamic range of the sound.
For example, a 16-bit sample size provides
much more dynamic range than an 8-bit
sample size. Choose 16-bit for music that has
both soft and loud sections, such as orchestral
music. For spoken voice or music that has a
more or less constant volume level, choosing
8-bit sound can still yield good results and will
result in a smaller file size.
If you need to shrink your media file, you can
reduce the sample size from 16 bits to 8 bits.
This cuts the file size in half but also degrades
sample size