The Electro Harmonix Ring Thing is a single side band modulator. The Ring Thing is unique in that it can automatically tune to a note you play on your instrument. So all the modulation is still "in tune" with what you play. The MOD input allows you to use an external oscillator, and EXP input allows for an expression pedal.
The EHX Ring thing also features:
- Stereo outs
- Multi-wave selection for modulation and Ring Mod
- Low pass Filter for Ring Mod and single side band modes
- Fine and depth control for frequency select and amount
- Tune switch to adjust frequency to your pitch
- Upper and lower sideband isolation
- High quality whammy style effects with expression pedal
- Pitch shifting with pitch modulation and vibrato
- Fully programmable
