Hi Vincent and Alex! Vincent, I have been trying to calibrate recordings too and want to use the PAMGuide package from Merchant et al (2015)*. You may want to check this out too. I'll post the full citation below. Alex, to use the calibration function in the PAMGuide package, I'd need a few pieces of information. As per Merchant et al: "To retrieve the original measurement of sound pressure from the audio files, it is necessary to know: (i) the sensitivity of the acoustic transducer, which defines how much voltage is generated per unit of sound pressure; (ii) the amount of voltage gain (if any) applied by the pre-amplifier; and (iii) the ADC input voltage which corresponds to the maximum amplitude that can be represented in the audio files. I've been having a hard time finding these specs for version 1.1.0. Would you happen to know these, or where I can find them? Thanks for such awesome devices, I love working with them! Best, Silvy *Merchant, N. D., Fristrup, K. M., Johnson, M. P., Tyack, P. L., Witt, M. J., Blondel, P., & Parks, S. E. (2015). Measuring acoustic habitats. Methods in Ecology and Evolution, 6(3), 257-265.