Reverb

Reverb simulates the natural reverberation of rooms — from the intimate chamber to the vast cathedral. It gives the tone space and depth and lets a guitar sound "somewhere" instead of dry in the void. Hardly any sound does entirely without it.

Reverb types — Spring: the splashy, slightly metallic reverb of classic Fender amps; formative for surf and vintage sounds. Plate: denser, smoother studio reverb, very musical for leads and vocals. Room/Hall: naturalistic room simulations from small to large. Ambient/Shimmer: modern textures, often enriched with octaves, for floating, atmospheric sounds.

Typical controls — Reverb/Mix (amount), Decay/Time (length of the tail), Tone/Damping (brightness). More controls means more command over the simulated room's size and character.

Dosing — A little reverb makes almost any sound more pleasant and "real". Too much pushes the guitar backward and takes definition — in a band context especially, too much reverb eats through cut. Dry plays more precisely, wet sounds bigger; the middle is usually the goal.

Prominent references — Spring reverb lives in the amp itself (classic Fender combos); among pedals, the Strymon character (BigSky/Flint) and the EHX Holy Grail stand for versatile and atmospheric reverbs, the Boss RV series for the practical all-rounder. Tonal references, not a ranking.

Reverb is the effect most likely to be "always on". No type is superior — spring, plate and hall solve different spatial tasks, and the right amount is almost more important than the type.