Apple Soundtrack Pro 3 - Manual (Page 500)

When used Bit depth
In the past, 8-bit audio was often used for CD-ROM and web video.
Today, 16-bit audio is usually preferred, but available bandwidth
and compatibility with your target user’s system are your chief
considerations when outputting audio for multimedia use. 8-bit
1 Many consumer DV camcorders allow you to record four audio channels using 12-bit mode, but this is not
recommended for professional work.
500 Appendix B Audio Fundamentals