Effect 7xy
From Famitracker Wiki
7xyis the tremolo effect (volume vibrato). It can be used on any channel except triangle and DPCM. x sets the speed of the tremolo, with larger value meaning faster tremolo. 70y disables the tremolo. y sets the tremolo depth, with larger value means deeper vibrato. Note that the maximum value for y is 7.
Example
C-4 00 F --- --- -- - --- --- -- - 762 --- -- - --- --- -- - --- --- -- - 700
C-4 is note, 00 is instrument number, F is volume. Tremolo starts from line with 7xx effect and will continue until 700.
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