Very simple device to use. I have already been able to perform several tests. It works just as well with an electric guitar as with an acoustic one. Regarding the acoustic guitar in question, it is equipped with a passive piezo sensor (with a very high impedance). With the IRIG USB, the signal is well captured when the gain is at maximum. For Android smartphone owners, the IRIG is perfectly recognized and allows native recording of the signal via the Camera (as an external microphone), the voice recorder, and all the recording applications I have tried. One remark concerns the quality of the plastic used. Something tells me it will quickly become sticky (like some remote controls).