Fresh2o
Aquarium Advice Addict
I believe the voice>text on the app is only for phones which do it for other things as well, if you can't do voice>text on other things, you probably can't do it on the app.
For iPhones I think it is only with models 4s and 5, some iPads; not sure about iTouch. It has Siri and I can ask it questions (appropriate and inappropriate lol), directions, read mail/text, etc. As for apps go it is a big battery drainer.