I'm a big fan of this circuit for LFO's
For a start the triangle waveform shape is continuously variable from ramp up, through triangle, to ramp down. The pulse output also varies between a pulse spike, through a square waveform and to an opposite pulse spike.
Its part of a bigger circuit that uses the other 2 opamps in the TL074,. You only really need to use oth sides of a TL072 or similar, rather than the TL074 on the diagram,