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Improvement to volume sampling in TIA audio (#1038)
volume of audio channels sampled every on every tick. sum of samples is averaged and a new sample output twice per scanline this fixes issues with ROMs that change the volume of the audio multiple times per scanline. for example, the experimental ROM in the following thread now works correctly https://forums.atariage.com/topic/370460-8-bit-digital-audio-from-2600/ (note that the ROM does not initialise the machine cleanly and so running the emulator with developer options (random memory etc.) can cause incorrect audio)
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