Welcome to the forum. Thank you for signing up.
Glad you were able to figure out an aswer on your own. Thank you for posting your solution, as I'm sure it will help future users. If I may ask - what software, and platform (Win or Mac) you're using?
Ok, so I think I just worked it out!
Looking in this panel:
I can pause the different colours and then switch out the pen before continuing!
Hope this helps if anyone else comes across this.
Cheers
Phil