There are a lot of cardiology sites on the web. One that seems particularly good to me is made by UK medical students for medical students covering the systems. Inevitably there are a few ads, but generally it is done well:
Clinical skills for medical students
aortic stenosis systolic ejection murmur
mitral regurgitation pansystolic murmur
FOR WEBSITES, COPY THESE AND PASTE THEM IN YOUR BROWSER.
they all are good websites with interactive heart sounds
Good heart sounds sites
Plus respiratory sounds
Heart size Xrays: – apex beat will differ in each case, and there will probably be parasternal heave/apical heave in the larger hearts.
Mechanism of 3rd and 4th heart sounds