I'm trying to create a real time fft visual equalizer on my RasPi touchscreen bluetooth stereo with AMP+ using python alsaaudio. I've been able to find one or two projects for reference but it's not in conjunction with the HifiBerry boards. I'm getting a certain level of success using code found from this reference https://dsp.stackexchange.com/questions/15625/plot-real-time-fft-using-matplotlib. however I'm getting a "connection refused" exception thrown. Is there any way that I can get the music to go to the hifiberry board and also be able to use it for real time fft?