I does does work, I only have to reset the circuit after uploading.
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Hey, You could use an IIR-filter. IIR ask a litle CPU from the chip. At the site: http://www-users.cs.york.ac.uk/~fisher/mkfilter/trad.html you can design your filter. Here is a little guide to use the site: 1) For audio you choose the "Butterworth" filter (this has a flat passband). The y...