@synths Voltage-controlled LFO. Another one of my own design. It’s pretty simple. Square and triangle output, one knob for freq, a jack to control freq with CV, and an attenuator for that jack.
This is an early revision with kinda awkward control placement: the two knobs and the input jack are tightly packed. Also note the triangle output is not a perfect triangle: it’s got a bit of a log curve to it, and the rise/fall time are not perfectly balanced.