uint16_t logsinTable[256];
    uint16_t expTable[256];

    void initTables() {
        for (int i = 0; i < 256; ++i) {
            logsinTable[i] = round(-log2(sin((double(i) + 0.5) * M_PI / 256.0 / 2.0)) * 256.0);
            expTable[i] = round((exp2(double(i) / 256.0) - 1.0) * 1024.0);
        }
    }

    uint16_t lookupSin(uint16_t val) {
        bool sign   = val & 512;
        bool mirror = val & 256;
        val &= 255;
        auto result = logsinTable[mirror ? val ^ 0xFF : val];
        if (sign) result |= 0x8000;
        return result;
    }

    int16_t lookupExp(uint16_t val) {
        bool sign = val & 0x8000;
        int t = (expTable[(val & 0xFF) ^ 0xFF] << 1) | 0x0800;
        int result = t >> ((val & 0x7F00) >> 8);
        if (sign) result = ~result;
        return result >> 4;
    }

    int main() {
        initTables();
        int vol = 0; // 0..15
        int env = 0; // 0..127
        int am  = 0; // 0..13
        for (int i = 0; i < 1024; ++i) {
            auto s = lookupSin(i);
            cout << lookupExp(s + 128 * vol + 16 * env + 16 * am) + 256 << endl;
        }
    }