 another x times before continuing". If the start
     of the loop was not set, it will default to the start of the
     current pattern. Hence 'loop pattern' cannot be performed across
     multiple patterns. Note that loops do not support nesting, and you
     may generate an infinite loop if you try to nest 'loop pattern's.

[14][7]: Set tremolo waveform
     Where [14][7][x] means "set the waveform of succeeding 'tremolo'
     effects to wave #x". Similar to [14][4], but alters effect [7] -
     the 'tr