Reference

Digital Mode

'Digital Mode' is activated using the button so labelled (in the top right of the GUI).

In this mode, some of the tape simulation processing is disabled, allowing for perfectly clean, 'digital' looping, with no colouration/degradation of the sound as it loops.

Even with the digital mode button pressed, other settings have to be right for the mode to actually be active. The indicator above the button will turn green when digital mode is in fact active. These settings are as follows:

The pitch control must be at zero (i.e. centred).
The pitch LFO depth must be zero.

If delay inertia is active, digital mode will also be inactive for a while around delay time changes, while the delay times settle down.

It's worth noting that CPU load is fairly dramatically reduced in digital mode.

Also note that if you want a totally clean loop, you should also set the filter to 'Thru' and turn off the saturation. NB setting the saturation knob to zero is not the same as turning it off (by pressing the button).