AudioMixer SetFloat initialization problem (beta17)

Heya! Ran into a weird glitch. checkout this code:

Code (CSharp):

1.         float volumeSetting = 0; // 0...1
2.         float vol = (volumeSetting * 80) - 80; // convert to DB
3.         musicChannel.audioMixer.SetFloat("musicVol", vol);
4.         float val = 666;
5.         musicChannel.audioMixer.GetFloat("musicVol", out val);
6.         Debug.Log("setting music to "+vol+" ("+val+")");

This outputs:

Code (CSharp):

1. // setting music to -80 (-0.102)

So my problem is that GetFloat isn't returning the value that Setfloat created, which is very strange.

Furthermore,

If this script runs on the very first frame (initialization/Awake phase), the musicChannel in the Editor shows a net change of zero (it remains at the default of 0 db).

If this script runs on a later frame, the Editor shows the correct value (in this case, -80), but the GetFloat still returns -0.102.

Am I doing something really wrong or is this a bug?