Re: Have a working 'expander' based on DolbyA (not same design) -- works well. Reply #25 – 2017-11-15 00:17:09 As promised -- this is the source code for the 4 band expander, with built binaries for Linux. I think that it is all there. The only bugaboo might be that I used zip to put the files together instead of my normal tar Jcvf... I don't normally use zip... I do get real noise reduction, and if you use this -- the --info switch can really help understand what is going on (and you can see the gains move all over the place.) Yea, the display is slow, but good enough for me to be able to debug the code.At least, I try to follow through with my promises :-).