"Which Venom kills, and saveth such as Venom chance to take."

ERD/TOAD is an hermaphroditic analogue computer driven by the times of pulses and slopes, designed to model both physical and imaginary processes underlying the vocal emissions of various twinned lunar and solar creatures (such as ravens and toads). Ruddy, bursting and overcharged, running by turns hot and cold, breaking and stretching tracts and redefining pulses and control as the venomous spots on the belly of a bulky blackened TOAD, they bring forth all the rarest colours.

By default TOAD re-implements physicist Gabriel B. Mindlin’s ouroboric differential equation which models the mechanisms of birdsong production, computing oscillations within the bird’s syrinx, or sound producing organ. TOAD’s analogue computing elements are normed to follow this model and generate oscillations; only a clock signal (normed to multipliers and all clocks) needs to be supplied to generate audio. This signal can be any changing signal or pulse (it is converted to a clock internally).

With a few connections, TOAD can also be used to model chaotic equations from J. C Sprott’s “A New Class of Chaotic Circuit,” producing oscillations and filtering incoming signals in the audio domain.

TOAD can compute any number of audible physical and less-than-physical models using three switched capacitance integrators, a square function, three inverters, one signum function and seven multipliers (some of these are embedded within other functions).

It is recommended to purchase and use ERD/TOAD together with the acquisitio module. Special pricing is available for TOAD in conjunction with modules from the ERD geomantic toolkit (please contact for availability and pricing)

For more information visit the ERD website https://www.1010.co.uk/org/ERD.html