Sampling rate retrieval
Generally the driver is allowed to adjust the sampling rate if the requested sampling rate is not possible.
There is now a function where you can retrieve the actual sampling rate, in case the driver has altered it:
getSamplingRate()
As a rule of thumb sampling rates of 1kHz, 500Hz, 250Hz are always possible with the USB-DUX boards. Higher sampling rates are only possible if you use less channels.