ROOM is a simple reverb effect boasting much tasty character comprised of modulated all pass delay lines with high and low pass filters in the main feedback path.
features:
FEEDBACK controls the overall feedback around the loop. At max, the verb will sustain nearly indefinitely.
LP and HP control the cutoff frequencies of the high-pass and low-pass filters in the main feedback path. Adjust LP for darker, danker, sounds. Adjust HP to remove boom, simulate smaller spaces, or create long twinkly sizzles.
SIZE controls the length of the internal delay lines. At minimum you get little cabinets or bathrooms, at max you get deep halls and spacious canyons.
ROOM is retro. It's kind of noisy. It is deliciously useful.