Mute app on iPhone?

Question

iPhone

There's Wally's financial accounting app, and everything would be fine if it didn't make a nasty loud "ding" every time something was added. Is there any way to prevent the program from accessing the speakers using regular means? Shut it up by any means possible. No jailbreak, iOS7.
Unfortunately, it is not possible to shut it up in the program settings - there is no item about sounds there.

Answer 1

Does iOS allow access to the application folder without jailbreak? Something like "/private/var/mobile/Applications/2F3E897A-031C-4D44-8845-34D123CECF67/Wally.app/". If there files with sounds are in open form, one could try to find the right one and delete / replace it with a dummy file.

Answer 2

I generally sit in silent mode all the time. It's very convenient on iPhone :)