OK, now I'm running into a problem with SampledSoundList. Are there strict requirements on soundlists that can be exported to various formats?
In[112]:= AbsoluteTiming@Export["test.mp3", sound]
During evaluation of In[112]:= Export::nodta: Sound[SampledSoundList[{0.00914949,0.0645038,0.10364,0.119694,0.118204,0.11123,0.108125,<<37>>,-0.0343303,-0.0115127,0.0102955,0.0199559,0.0169125,0.00949124,<<176351>>},<<1>>]] contains no data that can be exported to the MP3 format.
Out[112]= {0.413006, $Failed}