[el-mapache]

Does the developer have access to the raw data stream as well? I.e, can I apply filters the audio or record the incoming data?

If not, will I be able to run this concurrently with multiple audio gathering programs? Should probably google if a computer's input source can be multiplexed in that way :)

[bstrong]

We don't provide any special support for doing this, but we do give you access to the browser's MediaStream object. You can attach that to an AudioContext and use the web audio API to do what you're asking for.