Feeding a MATHS output back into its own CV input breaks the linear response, giving shapes Vari-Response cannot

A recurring MATHS patch philosophy is self-feedback: route one of its outputs (Variable, Unity, EOR, or SUM) back into one of its own CV inputs (Rise, Fall, or BOTH). This makes the control depend on the output it is shaping, breaking the linear relationship and producing responses — from subtle slope-softening to complex, quasi-chaotic modulation — that the Vari-Response control alone cannot reach. Routing to Rise or Fall CV bends one slope independently (the ‘Independent Contours’ patch); routing an output through an external filter and back into BOTH CV yields organic, self-modulating pitch/shape instability (the ‘Chaotic Trill’). The general lesson: an output patched to its own control input turns a static shaper into a nonlinear, evolving one.

Examples

CH1 Variable Output -> CH1 Fall CV, using the attenuverter to set feedback depth, warps the decay slope. Chaotic trill: CH4 output -> MMG low-pass filter -> CH4 BOTH CV -> self-modulating waveshape.

Assessment

Why does patching a MATHS output into one of its own CV inputs produce nonlinear behaviour? What is the difference between feeding back to Rise/Fall CV versus BOTH CV?