211 FS/AP
| Manufacturer | Serge Synthesizer |
| Function | Effect (4st generation modules) |
| Produced | 1981 |
| Country | USA |
| Form Factor | Modular - Eurorack |
| Signal Path | Analog Hardware |
| Notes | allpass ladder for frequency shifter |
| Manufacturer | Serge Synthesizer |
| Function | Effect (4st generation modules) |
| Produced | 1981 |
| Country | USA |
| Form Factor | Modular - Eurorack |
| Signal Path | Analog Hardware |
| Notes | allpass ladder for frequency shifter |