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Sound create use FM synthesis use C program. Use 0.3*expf( -time ) envelop. Algorithm 2 of YM2515 chip (not use chip, only follow its algorithm in C program) • no feed back • use two oscillator group (same ampl, different freq): GROUP 1 • ampl_m1 = 0.638*8.0 • ampl_m2 = 1.000*8.0 • ampl_c1 = 0.220*8.0 • ampl_c2 = 0.704*8.0 • freq_m1 = 929.040 * 2.0 Hz • freq_m2 = 232.575 * 2.0 Hz • freq_c1 = 1860.603 * 2.0 Hz • freq_c2 = 929.040 * 2.0 Hz GROUP 2 • ampl_m1 = 0.638*8.0 • ampl_m2 = 1.000*8.0 • ampl_c1 = 0.220*8.0 • ampl_c2 = 0.704*8.0 • freq_m1 = 737.344 * 2.0 Hz • freq_m2 = 184.609 * 2.0 Hz • freq_c1 = 1476.875 * 2.0 Hz • freq_c2 = 737.344 * 2.0 Hz