Hey Kristian:
How's things down at the local pub? I'll have a Scotch neat. {but from the Colonies, I need ice.}
Nay, nay, man. Many times I've been doing the bass line on a track of my MD-8 and I botch it up; NO NEED TO ERASE THE TRACK. I just stop and push the button, get back to the start and restart and RECORD RIGHT OVER WHATEVER I BOTCHED UP. Never have had a problem.
I usually get the drum track down first; then, I get in some chords; then, I add the bass line; after that, it's whatever I feel will work in a particular tune. About a month ago I wrote two ISLAND-RHYTHM type tunes; I added the steel drums to fill in some spots after I had most of the tune down. Then, there is always a spot to add in strings, etc.
As I said above, NO NEED TO ERASE THE TRACK; JUST GO BACK TO START, ARM THE TRACK TO RECORD AND PUSH START.
Hope this helps,
Green Hornet