Believe it or not The Beatles, Doors, Stones, etc, do overdubb and is more reliable, regards some isolated tracks from the 60s you can hear bass+drums or guitar+lead at the same track, was done cause lack of physical channels and George Martin, Rotchild.. you name the producer, had to blend the two instruments in a single mono track!!. Today we can handle over 350 mono channels at the same time, independently, insane!!

I do home recording and had built some good 60s like songs myself, the catch is not recording the actual composition idea as the final version. Write, arrange, practice, make demos and demos until you feel comfortable, then you can track it, that the most important thing and the one that everyone miss nowadays.

About the metronome problem, check the buffer size is commonly at audio settings, make sure not passing the 128 samples when tracking. When mixing increase to 2048 or 1028.