Set speed
Where [F][x][y] means "set speed to x*16+y". Though it is nowhere near that simple. Let z = x*16+y. Depending on what values z takes, different units of speed are set, there being two: ticks/division and beats/minute.If z<=32, then it means "set ticks/division to z" otherwise it means "set beats/minute to z". Default values are 6 ticks/division, and 125 beats/minute.