USB Host Audio v1.0 Streaming interface alternate setting number 

This configuration constant defines maximum number of Streaming interface alternate settings provided by any Device that will be connected to this Audio Host. The value of this constant should be at-least 1.

#define USB_HOST_AUDIO_V1_STREAMING_INTERFACE_ALTERNATE_SETTINGS_NUMBER 

Supporting multiple alternate settings per streaming interfaces requires more data memory and processing time.

If the USB Audio v1.0 Host application must support a USB Audio Device with 2 alternate settings including Alternate Setting 0 then this constant should be defined to 3.