added _rate field to actually hold that value to WebAudioSoundManager
added _rate field to actually hold that value to WebAudioSoundManager

BeanSeed/phaser,spayton/phaser,photonstorm/phaser,pixelpicosean/phaser,mahill/phaser,TukekeSoft/phaser,englercj/phaser,TukekeSoft/phaser,spayton/phaser,rblopes/phaser,photonstorm/phaser,TukekeSoft/phaser,mahill/phaser,BeanSeed/phaser