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# Echo
## Description
The Echo unit creates echoes.
## Parameters
Parameter | MIDI CC # | Description | Physical Control |
|---|---|---|---|
Enable | `CC-105` | Turn the effect on/off | switch`SW-4` |
Amp | `CC-2` | Amplitude level of echoes relative to the direct signal | knob`HADC-0`|
Feedback | `CC-3` | Controls the number of echo repetitions between 1 and infinity. | knob`HADC-1`|
Delay | `CC-4` | Time between echoes in seconds. Under Expert there is a Delay Glide which is a portamento for changing the delay time, and is also performable. | knob`HADC-2`|
Warp | `CC-62` | Warp moves the output delay-line tap at a rate controlled by Glide. It can create temporary "glitching" (low Glide) or Doppler shifts (high Glide) - performable (thanks to Glide) | knob |
DelayT60 | `CC-60` | DelayT60 controls the speed of Delay, Warp. It gives the time to DelayT60 to the next knob setting in seconds. contents. | knob |
FeedbackSim | `CC-76` | When an echo is fed back to echo again, it is also lowpass filtered according to this parameter. Tone = 0 ("Digital") corresponds to no filtering, while Tone = 1 ("Tape") gives maximum lowpass filtering, like an old magnetic tape. | knob |
## Building the Example
The faust code (.dsp) in this directory has been compiled using `faust2sam` into `echo-sam`
```
% faust2sam -midi echo.dsp
```
The result of this compile is a zip file `echo-sam.zip` which contains the following three files:
- `fast_pow2.h`
- `samFaustDSP.cpp`
- `samFaustDSP.h`
These 3 files should be placed into the directory `sam_baremetal_framework_core1/src/faust`
In addition there is a header file that is common across all cores called `audio_system_config.h`. In this file the following pre-processor variables should be set in the following way. The example below indicates that a Faust algorithm will only be running on Core1 and that Core2 will be simply passing audio to the codec.
```
#define USE_FAUST_ALGORITHM_CORE1 TRUE
#define USE_FAUST_ALGORITHM_CORE2 FALSE
```
Once the project is compiled, linked and loaded to the SAM board, the MIDI control API is as follows:
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