The result of EffectData appears to always be null. I did not see any place where set_EffectData was being called, therefore audioData is always null.
Merge pull request #1387 from totallyeviljake/EFFECT_DATA_IS_ALWAYS_NULL

EffectData is always null
Merge pull request #1388 from flibitijibibo/matrixfix

Fix Matrix::Transpose.
Merge pull request #1379 from flibitijibibo/msadpcm

Add MSADPCM WaveBank support
Merge branch 'develop' of git://github.com/mono/MonoGame into develop