PT2259 每次调音，从-79db 到0db 声音听起来不顺，声音每次跨十位.-10db,-20db,-30db ,音量会忽变. 其它个位0~9 范围，音量感觉无变化．
static const unsigned char pt2259VolTab[][2] =
{
//{PT_NEG_70DB, PT_NEG_09DB}, // hi, low
//十位 //个位
{PT_NEG_70DB, PT_NEG_09DB},
{PT_NEG_70DB, PT_NEG_08DB},
{PT_NEG_70DB, PT_NEG_07DB},
{PT_NEG_70DB, PT_NEG_06DB},
{PT_NEG_70DB, PT_NEG_05DB},
{PT_NEG_70DB, PT_NEG_04DB},
{PT_NEG_70DB, PT_NEG_03DB},
{PT_NEG_70DB, PT_NEG_02DB},
{PT_NEG_70DB, PT_NEG_01DB},
{PT_NEG_70DB, PT_NEG_00DB},//10
{PT_NEG_60DB, PT_NEG_09DB},
{PT_NEG_60DB, PT_NEG_08DB},
{PT_NEG_60DB, PT_NEG_07DB},
{PT_NEG_60DB, PT_NEG_06DB},
{PT_NEG_60DB, PT_NEG_05DB},
{PT_NEG_60DB, PT_NEG_04DB},
{PT_NEG_60DB, PT_NEG_03DB},
{PT_NEG_60DB, PT_NEG_02DB},
{PT_NEG_60DB, PT_NEG_01DB},
{PT_NEG_60DB, PT_NEG_00DB},//20
{PT_NEG_50DB, PT_NEG_09DB},
{PT_NEG_50DB, PT_NEG_08DB},
{PT_NEG_50DB, PT_NEG_07DB},
{PT_NEG_50DB, PT_NEG_06DB},
{PT_NEG_50DB, PT_NEG_05DB},
{PT_NEG_50DB, PT_NEG_04DB},
{PT_NEG_50DB, PT_NEG_03DB},
{PT_NEG_50DB, PT_NEG_02DB},
{PT_NEG_50DB, PT_NEG_01DB},
{PT_NEG_50DB, PT_NEG_00DB},//30
{PT_NEG_40DB, PT_NEG_09DB},
{PT_NEG_40DB, PT_NEG_08DB},
{PT_NEG_40DB, PT_NEG_07DB},
{PT_NEG_40DB, PT_NEG_06DB},
{PT_NEG_40DB, PT_NEG_05DB},
{PT_NEG_40DB, PT_NEG_04DB},
{PT_NEG_40DB, PT_NEG_03DB},
{PT_NEG_40DB, PT_NEG_02DB},
{PT_NEG_40DB, PT_NEG_01DB},
{PT_NEG_40DB, PT_NEG_00DB},//40
{PT_NEG_30DB, PT_NEG_09DB},
{PT_NEG_30DB, PT_NEG_08DB},
{PT_NEG_30DB, PT_NEG_07DB},
{PT_NEG_30DB, PT_NEG_06DB},
{PT_NEG_30DB, PT_NEG_05DB},
{PT_NEG_30DB, PT_NEG_04DB},
{PT_NEG_30DB, PT_NEG_03DB},
{PT_NEG_30DB, PT_NEG_02DB},
{PT_NEG_30DB, PT_NEG_01DB},
{PT_NEG_30DB, PT_NEG_00DB},//50
{PT_NEG_20DB, PT_NEG_09DB},
{PT_NEG_20DB, PT_NEG_08DB},
{PT_NEG_20DB, PT_NEG_07DB},
{PT_NEG_20DB, PT_NEG_06DB},
{PT_NEG_20DB, PT_NEG_05DB},
{PT_NEG_20DB, PT_NEG_04DB},
{PT_NEG_20DB, PT_NEG_03DB},
{PT_NEG_20DB, PT_NEG_02DB},
{PT_NEG_20DB, PT_NEG_01DB},
{PT_NEG_20DB, PT_NEG_00DB},//60
{PT_NEG_10DB, PT_NEG_09DB},
{PT_NEG_10DB, PT_NEG_08DB},
{PT_NEG_10DB, PT_NEG_07DB},
{PT_NEG_10DB, PT_NEG_06DB},
{PT_NEG_10DB, PT_NEG_05DB},
{PT_NEG_10DB, PT_NEG_04DB},
{PT_NEG_10DB, PT_NEG_03DB},
{PT_NEG_10DB, PT_NEG_02DB},
{PT_NEG_10DB, PT_NEG_01DB},
{PT_NEG_10DB, PT_NEG_00DB},//70
{PT_NEG_00DB, PT_NEG_09DB},
{PT_NEG_00DB, PT_NEG_08DB},
{PT_NEG_00DB, PT_NEG_07DB},
{PT_NEG_00DB, PT_NEG_06DB},
{PT_NEG_00DB, PT_NEG_05DB},
{PT_NEG_00DB, PT_NEG_04DB},
{PT_NEG_00DB, PT_NEG_03DB},
{PT_NEG_00DB, PT_NEG_02DB},
{PT_NEG_00DB, PT_NEG_01DB},
{PT_NEG_00DB, PT_NEG_00DB},//80
};
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