| Input index | Description | Summary |
|---|---|---|
| 0 | input signal | An incoming signal to echo |
| n | input signal | An incoming signal to echo. Any number of signals can be connected to Empty. |
| Output index | Description | Summary |
| 0 | output signal | Output signal which is equivalent to input signal 0. Returns zero if no input signal on that channel. |
| n | output signal | Output signal which is equivalent to input signal n. Returns zero if no input signal on that channel. |