While working through Chapter 1 of the cSound book, we discovered there could be a problem with the Loscil Opcode. After double checking destination folder and buffer size, it still reported no legal base frequency, and the aif file was not played correctly until we found the correct base frequency of 440 hz and entered it as the fourth argument. It appears that the loscil opcode is having issues reading the base frequency imbedded in a file for this version of programs.
Csound 5.08 OSX 10.4-PPC
Files used: sing.aif from the cSound catalog, as well as several of my own files saved using Peak Pro 5.2