I use 17-byte $00 and $FF DPCM ramp samples to give a "1-bit volume control" to the triangle channel. This of course affects the noise volume as well, and I thought I should add a certain value to the noise volume when it's non-zero and the DAC level is at max (or $7E anyway) to make up for the difference. Then I figured using a conversion table could work a lot better. Apparently using volumes higher than 7 means there is no corresponding volume for the low APU2 volume. Using Famitracker I found some values for conversion but if there's a better way based on real data dealing with how the DAC level affects the amplitude, I'd love to hear it.
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DAC=00 DAC=7E 7 -> F 6 -> E 5 -> D 4 -> A 3 -> 8 2 -> 5 1 -> 3 0 -> 0