The effect is named after a chorus of voices. Small differences in timing and pitch make one source seem like several. Chorus is common on clean guitar, bass and atmospheric parts, but too much depth can make chords sound seasick or out of tune.
Chorus mixes the dry guitar with one or more slightly delayed copies whose timing and pitch move gently. The ear interprets the small differences as several performances occurring together, which makes the sound wider and more fluid.
Rate controls speed and depth controls amount
Rate sets how quickly the modulation cycles. Depth sets how far the delayed signal moves. A slow, shallow setting adds width; faster or deeper settings produce an obvious wobble.
Depth
Depth controls how far the delay time and pitch move. Higher depth sounds more dramatic.
Mix
Mix blends the effected copy with the dry signal. A small mix can add width without making the effect obvious.
Mono and stereo chorus feel different
In mono, the moving copy is blended into one output. Stereo chorus can send related but different modulation to the left and right sides, creating a much broader image through headphones or two speakers.
Chorus can be used on distorted guitar
Placed after distortion, chorus widens the complete driven tone and keeps the modulation clear. Before distortion, the moving signal is clipped afterward and becomes more blended and textured.
Hear what the controls change
- Start with slow rate and low mix.
- Use a clean sustained chord with rate and depth low, then raise one control at a time.
- Compare mono and stereo if available.
- Turn chorus off periodically to check whether it is helping.
- Compare chorus before and after distortion to hear how placement affects clarity and movement.
When the effect does not sound right
The guitar sounds out of tune
Reduce depth and mix. Strong pitch movement is the usual cause.
The effect disappears with distortion
Place chorus after distortion or reduce the amount of gain so the modulation remains clear.
The chord loses focus
Reduce depth or mix and slow the rate. Chorus is often most convincing when you notice the width after bypassing it rather than hearing a constant dramatic wobble.