//! Optional stages for dynamics, saturation, reverse loops and reverberation.
//!
//! Punch and Warm operate on mono PCM before resynthesis. The processor does
//! not call their sample methods while they are disabled. Alien and reverb
//! accept stereo Q14 frames after resynthesis. They have their own bypass
//! behavior. Alien continues to record during bypass. Reverb keeps its
//! current delay state during bypass.
//!
//! The configuration types validate the public controls. The prepared stage
//! types assume that these checks were successful.
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