Simple

How simple can computation be?

I think harmony can be a single equation:

    // get the pattern byte
    unsigned short patternByte = qdGetModePatternForPval (aKPDVE [1], partition);
    unsigned short answerBitByte = 0x8000;
    
    // SOLUTION FOR *ANY* DVE
    answerBitByte >>=  (aKPDVE[2] + aKPDVE [3] * aKPDVE [4]) % partition;
    
    // if the answer byte meets the displaced bit in the pattern, shift sharp-side or flat-side
    if ((answerBitByte & patternByte) == 0) {
        answerBitByte >>= (aKPDVE [1] < 4) ? partition : 12 - partition;
    }
    
    // bit shift for K
    return circleShiftLowestOctaveRight (answerBitByte, aKPDVE [0]);