I recommend Otocast. The platform as is works well, handles video and audio, and creates "tours" for people. You can also get some customization. It does go through their platform rather than as a stand-alone associated with you, but you can market them as your provider and direct people to their app (which has other tours in other cities as well).
Julia Muney MooreDirector of Public Art
Arts Council of Indianapolis
924 N. Pennsylvania St.
Indianapolis, IN 46204
(317) 631-3301 x 240
(317) 332-8382 mobile