someone please correct me if i am wrong but FC has nothing to do with those messages. eash individual application is coded to use an audio interface. those were coded to use OSS instead of ALSA (it appears). oss doesnt even come with FC anymore so i believe all FC does is provide an interface that redirects OSS to your ALSA device, and then let's you know about it, hence the warnings.
this explaination is based on little specific information and a lot of assumption.. so i may be wrong