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ADPCM-2 Codec Demo 2019-10-15

Mono playback was broken but is now working. The encoding filter now also computes in .8fxp accuracy, which should hopefully result in ever-so-slightly better quality.
New LPC coefficients to go with a slight psychoacoustic optimization in the encoder (emphasizes low-frequency error (by de-emphasizing high-frequency error), which is the most disagreeable kind of error signal). This results in a slight lowpass effect sometimes, but it sounds better overall.
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