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D673: Play Stored Sound
Never used. The routine from D674 makes a tone of a pitch that is held in the byte at PlayStoredSound, which is the instruction at the start of this routine, a 00. That makes the tone the same as the pitch FF, as the byte is inverted. It carries on as PlayWaveSequence.
PlayStoredSound D673 NOP Do nothing, as this byte is the pitch of the sound.
D674 LD A,($D673) Fetch the pitch.
D677 CPL Invert it.
D678 LD B,A Put it in B.
D679 LD C,$08 Set the length of the tone to eight cycles.
Continue on to PlayWaveSequence.
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