Audio enhancement.

[lodefmode]

"There was a suggestion of adding stereo sound, but if you are combining the two 4-bit TIA channels anyway, I might suggest a way to get 8-bit audio out of these two channels. Store one channel as normal, which contains the upper 4 bits of the sample. The second channel contains the lower 4 bits. For the second channel, turn it on then off exactly 5 cycles later, giving an effective attenuation of 5/76th across the scanline. I expect the sound quality could be vastly improved with such a method.
If using immediate loads, it's 5 cycles for one channel, 8 cycles for the second (assuming a value of zero preloaded somewhere to shut off the second channel after 5 cycles.)"

From batari, AA.