Lorena

That was really nice! I have just recently started making multi-tracked recordings myself and also use the audacity program. 
 Good work!

Hello Squacks. If you are over dubbing with Audacity (or similar program) it helps if you adjust for latency. 

manual.audacityteam.org/man/latency_test.html

I can now lay down multiple tracks and keep them in sync. 
Here is a song I recorded with maybe 6 or 8 different tracks by the time it was done. Every time an instrument comes in again it is a new track.

soundcloud.com/tremolo-rex/farther-along-with-vocal

I don't do a lot of multi tracking because I don't sing that well. Most of the time I will just back up the harp with some guitar or just record solo harp.

My mic plugs straight into the sound card. I have heard that USB mics have more latency problems. My computer is old and the latency was not only noticeable on the replay, it made playing new tracks very hard because the delay threw off my timing. If you have a fast computer it might not be so bad.