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I am looking to start a project that alters the waveform being fed into your speakers by analyzing the waveform that comes out. I know that MATLAB has some pretty nice tools for altering the waveform being played by your speakers, but I would really prefer to use a nicer more efficient language. What would be the best language/package for the purposes of this project? Ideally I would like to be able to simply add waves into something already being played by the speaker. Suggestions?
For cross-platform, you could try using the PortAudio library, and C as the most common language for real-time DSP code.
You could capture sound from speakers by plugging the line-out or a mic in front of the speakers into a USB ADC.