Dave, I like to set the transition points by ear on the timeline, one after the other, as I listen to the playback of the music. Then, using the waveform, I revisit each point and drag it to the correct position in relation to the beat of the music as shown by peaks on the waveform. I set the transition point slightly ahead of the beat, the distance ahead being proportional to the length of the transition, as it takes a few milliseconds before one notices the start of a longer transition.