[quote name='skej21' timestamp='1490128556' post='3262501'] Huge plus one. Additionally, music is either going to be strict in the nature of timing (i.e., required to follow a specific beat which you would use to judge yourself against, making the device redundant as you'd have the metronome and your ears as a reference) or there would be a natural (musical!) fluctuation in timing to the music as the instrumentalists bounce off each other (which, again, makes the device redundant as it would be more important to follow the other musicians than try to keep a strict time whilst everyone else around you doesn't). It appears that this kind of device offers at best, a crutch to the musician who wants to solely judge their timing against a non-musical source or at worst, would create a device that discourages the development of crucial aural skills and natural communicative elements of time/feel. IMO, This video by Victor is a great example of how time should be approached in order to develop overall musicianship rather than just a single skill without application or context; http://youtu.be/f_LKWFvpr0o [/quote] - Thanks for a very interesting comment - It is interesting that you that you consider that this device will offer a crutch to a non musical source, because the source itself will be the musician themself (or themselves) who are playing the music - think of this device more as a reference tool, as in a tuner for pitch (if you have ever practiced pitching exercises on fretless or double bass against a tuner, you will know what I mean), or a car speedo when a speed camera is coming up - it is simply a guide to your own precision. Consider also a live situation when a band could be playing in front of an audience, but be aware that their tempo is increasing due to dynamic increases, or other reasons - being able to be visually aware of any subtle changes in tempo, you are able to correct as a group, this of course is the same in any practice situation on your own. Metronomes are not for everybody, neither is this device, but it does offer an alternative, in that you do not have to watch it all the time, but more importantly, use your ears. Like the car speedo, it just tells you how well you are doing! - I would be grateful if you could do the survey for me - opinions like these are very educational - Thanks again! - https://docs.google.com/forms/d/1LYkSrbZqq5D5jOKohjFrUGknUQAk6PWhJUf_NOj8aRA/edit