I noticed on my microbrute using PWM with the triangle waveform as a modulation source that if the LFO is set to free run I can get a nice, smooth modulation speed getting faster as I turn the LFO rate knob to the right. When I turn the LFO rate to seq I notice there is glitching as I turn the LFO rate knob.
I think the Clocked LFO is divided into 4 different speeds and as you turn through into the next rate the clicks appear.