You can look at the USB device's advertised capabilities at USB level
(which are used by ALSA)  using the "lsusb -v" command.  Output is
verbose there are sections which are nearly self explanatory such as
fragment below.

Code:
--------------------
    
  AudioStreaming Interface Descriptor:
  bLength                26
  bDescriptorType        36
  bDescriptorSubtype      2 (FORMAT_TYPE)
  bFormatType             1 (FORMAT_TYPE_I)
  bNrChannels             2
  bSubframeSize           2
  bBitResolution         16
  bSamFreqType            6 Discrete
  tSamFreq[ 0]         8000
  tSamFreq[ 1]        16000
  tSamFreq[ 2]        32000
  tSamFreq[ 3]        44100
  tSamFreq[ 4]        48000
  tSamFreq[ 5]        96000
  
--------------------


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