Found all this interesting as just today my 7 year old asked me when could the baby hear and see, he has been using a toilet roll and yelling out wake up and are you ready to rumble and singing songs. And i have an advantage with story telling, my son has to read every night for school so he can do that for me, might encourage him to read more as well if he thinks the baby can hear him reading too.
Also i remember when i was pregnant with my first one he hadnt moved about in awhile so i put headphones on my stomach and played AC/DC through it and he jumped a mile, maybe it was a bit loud lol, but i felt better