Yeah tried it without headphones with my phone pressed against my ear. I barely managed to catch the last two reference tones most of the time after clicking ne

Yeah tried it without headphones with my phone pressed against my ear. I barely managed to catch the last two reference tones most of the time after clicking next. The 1/64ths were tough that way. I missed a couple of the first ones but started getting them after I got a good click, get the phone to the head to listen to the tones fast rhythm going on. I recommend headphones at the very least.