OPL series channel visualization
I suggest using the first 6 lights of FM and the first three lights of PSG to display the melody channel of the OPL series. If the OPL rhythm channel is used, the first 6 channels of FM are used to display the melody, and the remaining 5 lights are used to display the 5 rhythm channels. I want these rules to be used for OPL1, 2, 3 and OPLL. For OPL3, my idea is to divide the 18 channels into 9 groups, and then apply the above method.