Analog Audio ICs

I split the analog IC Manufacturers page into three sections;
General Analog ICs, the main page;
IC Codec Manufacturers,
Modem IC Manufacturers.

Each of the sub-pages were derived from the main Audio IC page. All the IC manufactures links seemed to still be working.

A Codec is similar to a ADC, A-to-D converters are listed on the A to D and D to A Converter ICs page.