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The sample frequency is added to the file-name for each data acquisition mode option, i.e. ICLISTENHF1234_20110101T000000Z-16KHZ.wav. There The Spectrogram_ModeDurationDPO is a device attribute on devices with a duty cycle that links the low frequency (LF) and high frequency (HF) acquisition modes with the exact file-name mode modifier string - if this link is not correct, the data acquisition mode option will not properly filter the data products.