.. in the visual synthesizer niseq: 13k LOC

.. in the upcoming Pmmd modular synth module

you can use S.fix to bind recursive relationships between modules

so the subscriber relation is inverted, relative to OO, where you register listeners

in effect, a FRP first class module, is a stateful instance, which others can subscribe to

you can use E.fold/S.fix inside a module to accumulate state

you can program with time-semantics in a declarative way

CV-in ports are given as functor params

CV-out ports are returned via functor result

events are equivalent to CV "gates"

signals are equivalent to ordinary CV

.. though ofc. much more is possible with FRP than with modular-synth modules

there is btw. a direct relation between modular-synth modules and this model too