Polyphase Filter Bank

Anyone know of a good PFB. I can’t find any real usable code. Currently I’m using cascaded FIR filters for band separation even with SSE and multi-threading it’s still a little CPU hungry and would like to use a PFB to make it more efficient.

I’m aware of needing the right delay lines of each band to realign samples due to decimated lower banding. Just after good band separation over 32 bands for analyser. Can’t use FFT in this instance.