The 'Waveform' and 'Offset' information sometimes turns from black to red in the 'Generator Output' panel on the Control tab. Can anyone tell me why this happens and what it means?

This is typical for contact based presets. The effect is from the option Swap Waveform Every x Seconds on the settings page. When it is Black, it is in normal mode. When red, Out 1 and Out 2 are switched.

This is enabled so that the polarity is reversed every x seconds to prevent buildup of acids on the skin.

For more details, please check the link:

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