One recipe for very strange sound-

Stack six oscillators in two columns of three. Each oscillator node provides a range of waveforms: sin, triangle, saw, triangle/saw composite, stairstep, sample & hold, pulse, bipulse. Each oscillator will spin out any frequency from LFO range upwards, and has selectable drift. Drift can be jump-started by a control signal based on amplitude in the source material. Since peaks will kick off new drift, it works a charm on rhythmic material.

Pass left and right signals through each columnar chain, oscillating the amplitude progressively with each node.

Here's where it gets fun. Create a ladder of variable recirculating feedback connections between the nodes. The signal flows back and forth between the columns and upon reaching the base... rolls through a delay and heads right back to the top of the ladder.

This short demo clip was made with all six oscillators in the chain set to sin wave. First is the dry loop, then a solo of the amplitude modulation effect, then a mix of both wet and dry.

SixCylinder Hood_Modulator (0:42, 44.1KHz, 128kbps, 668k).