b7c8cabe_dia__SoundInfo_Class_Reference__1
[2] Number of samples to seek forward or delay. If this value is positive, the player seeks this number of samples into the sound block before the sound is played. If this value is negative the player plays this number of silent samples before playing the sound block NOTE that this value refers to input samples, so must be multiplied by OUTPUT_SAMPLE_RATE/getSampleRate() and by 2 (two channels) to find number of output samples to skip or fill. [1] 
delaySeek
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Gnash: gnash::media::SoundInfo Class Reference
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