iOSSound of silence bug?

dim s as iOSSound = testSound
dim s2 as iOSSound = s.Clone
//s2.Volume = 100

testSound is a .wav I dragged into the project. The code as written above works. When commenting out the last line and uncommenting the s2 lines it doesn’t work. At first I thought it was because the clone shows a 0 volume in the debugger, but setting it to 100 doesn’t seem to make any difference. Am I missing something or is it a bug?