SAW$_2$ or SAW$_3$ is demonstrated in Figs. \[Fig3\](b) and \[Fig3\](c), respectively. When SAW$_2$ (SAW$_3$) is switched ON, IXs transported by SAW$_1$ to the intersection area are captured by the moving potential dots and transferred to SAW$_2$ (SAW$_3$). While the dot propagation paths are not spatially resolved in the experiment, their oblique propagation (cf. Fig. \[Fig2\](c)) is clearly observed within the intersection areas of the SAW beams in Figs. \[Fig3\](b) and \[Fig3\](c). The few IXs remaining within SAW$_1$ lead to the weak recombination observed in the lower part of this beam. From the PL image in Fig. \[Fig3\](b), we determined that more than 90$\%$ of the IXs are transferred from SAW$_1$ to SAW$_2$ and recombine near EXAT$_3$, thus demonstrating a high beam-to-beam transfer efficiency. These results demonstrate that IXs can be reversibly transfered from any input port to any output port by appropriately switching on at most three SAW beams. The overhead time for switching will be established by the bandwidth of the IDTs and by the length of the SAW channels.

![PL images of the acoustic IX transfer (a) along SAW$_1$ and between (b) SAW$_1$ and SAW$_2$ or (c) SAW$_1$ and SAW$_3$. The output EXAT in (a)-(c) is in the 