Demo of the Liquitone Tremolo with Glow at 3 o'clock and Freq at 4 o'clock while playing Subterranean Homesick Alien by Radiohead.
In this demo you can clearly hear the oscillator's waveform sits somewhere between a sine- and a square wave on this high depth setting.
If you lower the Glow knob, the wave evens out to more like a sine-like wave along with the lower intensity. This happens aswell with lowering the Freq knob
This is the 24 volts version of the tremolo.