ADPCM with an AU header. This is a common sound compresion format defined from telephony (CCITT G.721). It reduces the memory requirements by 50%.
A-law with an AU header. This is a less common sound format defined from telephony (CCITT G.711). It is a memoryless companding technique.
8 bit linear with an AU header, which means that 256 output levels are encode in a twos complement format.
µ-law (mu-law or Ulaw) with an AU header. This is a very common sound format defined from telephony (CCITT G.711). It is a memoryless companding technique.
This is the current selection for the format of the AU recording.