Checking Wave objects
Internal S4 generic function that checks for some kind of equality of objects of class
Wave or class
Does not return anything.
stops code execution with an error message indicating the problem
if the objects are not of the same class (either
WaveMC) or if
the two objects don't have the same properties, i.e.
identical sampling rate, resolution (bit), and number of channels (for
WaveMC, resp. stereo/mono for