Ah, gotcha - I had been imagining you meant prev/next with respect to a playlist. I think you can do that in Mixxx using the "cue" button. While playing, tappi

Ah, gotcha - I had been imagining you meant prev/next with respect to a playlist. I think you can do that in Mixxx using the "cue" button. While playing, tapping "cue" will rewind to the beginning of the track and pause; pressing "cue" and holding it down will preview from the beginning. While previewing, you can press "play" before releasing "cue" in order to continue playing; otherwise, releasing "cue" will rewind to the beginning and pause. So, you'd use a similar workflow: play from the beginning of the track and tweak until beatmatched, then press and hold "cue" to rewind to the beginning and start playing from the first beat. If it works, press "play", release "cue", and bring up the fader; if it didn't work, just release "cue" to rewind, then try again.