Setup:

sudo apt-get install portaudio19-dev

export GOPATH='/home/agah/gopath'

mkdir /home/agah/gopath/src/portaudio

git clone https://github.com/gordonklaus/portaudio.git

copy pa.c and portaudio.go in /home/agah/gopath/src/portaudio

go build portaudio

change ./examples/stereoSine.go to portaudio

go run stereoSine

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To generate A:

go run genSine.go 440 5

FFT

go get github.com/mjibson/go-dsp/fft