Changes
/* Logsin and Exponent tables */
The OPL3 uses two look-up tables, each containing 256 entries. [https://g.co/kgs/Da1vEi4 Source]
The OPL chip produces the sound without any multiplicationsmultiplication or other costly arithmetic operations, using for 2-op "frequency modulated" (actually phase modulated) synthesis the formula:
out = exp(logsin(phase2 + exp(logsin(phase1) + gain1)) + gain2)
