Two characteristically different patterns of oscillations were observed in the bromate-oxalic acid-Mn2+-acetone-sulfuric acid reaction in a stirred batch reactor depending on the method of mixing of the reagents. One of the patterns is a mixture of high- and low-amplitude oscillations, while in the other case a regime of high-amplitude oscillations is followed by a sequence of low-amplitude ones. In both cases, the acetone concentration can control the length of the induction period and the number of small-and high-amplitude oscillations.