A tape-delay effect in the built-in synth, RE-201 flavoured, with its knobs
exposed as matrix voices so any feed can drive them (and they groove/CV like
any voice). Audio chain: a delay with a feedback loop (lowpass tone roll +
highpass + tanh tape saturation), an LFO on delayTime for wow&flutter, and a
white-noise hiss bed for wear; the mix taps post -> echoIn -> wet -> out.
params() maps: echo.time -> delay 60-500ms with a LONG glide time-constant
(tape-motor pitch-bend), echo.feedback -> feedback HARD-CAPPED at 0.97
(self-oscillates, never runs away), echo.tone -> loop lowpass 6800->500Hz,
echo.flutter -> LFO depth, echo.wear -> hiss, echo.wet gated by earthEchoOn.
Sky menu "🌀 earth echo" toggles it (gs_echo persists); enabling installs the
earthy default cables: wind->time, volatility->feedback, air.pm25->tone,
moon->flutter, fire.count->wear, quake->wet. Verified: 6 echo voices appear in
the matrix with cables, zero console errors; param math unit-tested (feedback
capped, all ranges bounded, safe). Grimoire section added.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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