volume setting failed before play music

[hament]

I alloc a instance and set the volume while app launch :
self.player = [[ORGMEngine alloc] init];
[self.player setVolume:1.0f];
self.player.volume=34.0f;

However the volume is always 100% before playing music file .
After playing a music file the volume can be set successful.

My developer environment : os x 10.10 & Rmbp 15 inch

[hament]

oh ,sorry i paste the wrong code ~~
the code is

self.player = [[ORGMEngine alloc] init];
[self.player setVolume:0.0f];