On the VE-2, AUTO HARMONIST button turns on automatically when a guitar or other instrument is connected to the GUITAR IN jack. If the light does not turn on, check the following:
- Use a standard mono TS cable. Stereo TRS cables are not compatible with the GUITAR IN jack. If you are already using a TS cable, try a different one.
- Check the power source. Use a BOSS PSA series AC adaptor, or replace the batteries with new alkaline AA batteries.
- If the light does not turn on for a specific memory, AUTO HARMONIST may have been saved as disabled. Turn on AUTO HARMONIST and re-save the memory.