Holy crap y'all! With commentary/Jieshuo screen reader on Android, you can swipe to go to previous/next track, answer or decline calls... It's like the double tap but with yes/no prompts. So, with the normal gesture set where you swipe down for next item and up for previous item, you swipe right for yes/next/answer/speaker-phone, and left for no/previous/decline/hang-up. For the gesture set where you swipe left or right for previous/next item, down is confirm/next/answer/speaker-phone, and up is no/previous/decline/hang-up. And if you have it set similar to TalkBack, where up-down and down-up changes reading controls, set that to default, and down and up will work as the shortcuts, the binary magic tap thing.