I`ve had some time to try and use the optimized method in my project. Purely comparing instruction used, I`m finding my original project used 929 instructions, and the new one takes 1127 (over the 1024 boundary) even after removing the 3800 Hz and 4800 Hz bins like my original project did. I`ve re-checked my project to make sure I`ve removed only the original bin method, and replaced it specifically with the new method and I`m still coming up to the 1127 instruction number. Based on this I`m not realizing a 20% reduction in instructions like your mentioning Bob, but I`ll keep looking to see if I missed something. Haven`t had a chance to evaluate audio quality yet.
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