Hypercube is a polytempic polymicrotonal string quartet in four tunings and tempos, 12, 19, 31, and 53 tet, and 96, 76, 124, and 106 BPM, for my doctorate thesis in 2012. This is a live concert recording of Neo Quartet from Poland and is performed live in Paris Sept. 17, 2023. Yes, the quartet is using click tracks in personal ear buds from their devices. I worked with them on click tracks and the tunings are fairly good, from three other "mean tone" tunings aside from the 12tet in the first violin, to show the microtonal differences.