I can listen to or read Dutch separately or together. I can listen to or read German Harry Potter in the same way. With Japanese I’ve been collecting sample sentences for every kanji used in HP1. As I scan the lines in search of kanji, I listen to Harry Potter playing in the background from any part of the book.
I expose myself to the language in stereo!
With a new language like Spanish, however, I find that I’m a little impatient. So what I think I’ll do is to resurrect my technique of interweaving sentences. I love to experiment.