6091 is an older controller, in mid 2011 the 7092 replaced it. The main difference is that the 7092 has an autotune feature, you push a button and it scrolls through the frequencies of .30-2.00 seconds and you push it again when you see a wave to stop it. The 6091 was harder to tune, it had a simple knob to adjust the frequency. 7092 also merged the 7091 and 6091 controllers into one, the 7092 includes pulse mode but you would not use that on a wavebox.