PLL without a PLL module. Here a master oscillator is playing random notes, with its pulse output beating against the pulse output of a second, slave, oscillator. The result goes through a low-pass filter set to a sub-audio cutoff, producing a DC level that frequency modulates the slave. So in an ideal and static condition, the slave oscillator is locked to the same frequency as the master. But when the master frequency changes, because of all the approximations and inaccuracies in the patch, the slave may or may not be able to catch up. The track consists of the slave's output, processed through a Mutable Clouds and the MSK 007 Leapfrog Filter prototype.