Frap Tools: Stepped Random Voltages Unleashed – Infinite Textures with Just Three Modules

The video opens with Federico’s signature approach: extracting maximum complexity from minimal means. Here, a single unquantized sample and hold output from SAPÈL is routed into the 333, Frap Tools’ utility multiple, instantly creating up to nine identical copies of the random voltage. This is classic modular thinking—one unpredictable source, fanned out to orchestrate chaos across the system.

BRENSO’s final output is chosen as the sonic canvas, prized for its abundance of modulation points. By starting with just three modules, Federico sets the stage for a demonstration of how strategic patching can yield a soundscape that feels anything but minimal. The focus is on how a single random stream, distributed cleverly, can drive a patch far beyond its apparent simplicity.

Once the patch is established, Federico demonstrates the power of fine-tuning. Adjusting the oscillators’ frequencies and modulation amounts, he shows how even small tweaks can radically alter the patch’s character. Increasing the clock speed and playing with FM depth, the sound morphs in real time, each knob turn yielding a new shade of timbre.

He also explores the impact of re-routing modulation sources, such as patching the fifth copy of the sample and hold to the pulse shaper, overriding previous routings and stripping away timbre bus modulation. Removing the ping trigger and further adjusting clock and frequency settings, Federico illustrates how the interplay of random voltages and manual control keeps the texture in perpetual motion.

The final act introduces a second sample and hold circuit, this time clocked by the yellow generator and patched into the remaining section of the 333. By using the random clock output in “more than” mode to trigger the new sample and hold, Federico injects another layer of unpredictability. The ping circuit is now activated only by sufficiently high random values, creating a more erratic, less predictable behaviour.

The result is a patch that constantly reinvents itself. Each strike of SAPÈL’s sample and hold brings a fresh twist, making the sound nearly impossible to tire of. Federico’s demonstration underscores the creative power of random voltages in modular synthesis, showing how even a simple setup can yield a rich, ever-changing sonic landscape.