Here's the command: "WAVSET Definition number, Attack, Decay, Sustain, Release, "Waveform string", [Reference pitch (Optional)]". Also it describes "Waveform string" as
"-Hexadecimal string
-Two characters represent one sample value (8 bits)
-&H00 - &H80 (128) - &HFF (255)
-16, 32, 64, 128, 256, or 512 samples can be specified
-The number of characters should be twice the number of samples"
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