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# Flange
## Description
The flanger effect impresses uniformly spaced sweeping notches on the sound spectrum. It accomplishes this using a variable comb filter, which works by mixing the input sound with a variably delayed-and-scaled copy of the input. Unlike the phaser, the flanger notches are uniformly spaced on a linear frequency scale, and there can be many more of them at low cost.
## Parameters
Parameter | MIDI CC # | Description | Physical Control |
|---|---|---|---|
**Enable** | `CC-105` | Turn the effect on/off| switch`SW-4` |
**Rate** | `CC-2` | The Flanger Rate parameter sets the frequency of its LFO in Hz | knob`HADC-0` |
**Depth** | `CC-3` | Depth of spectral notches - performable - Depth = 0 means no effect, Depth = 1 means maximum effect (spectral-notch gains go all the way down to zero). | knob`HADC-1` |
**Feedback** | `CC-4` | Gain applied to the output signal and then summed with the input signal - performable | knob`HADC-2` |
**Delay** | `CC-50` | Maximum Delay (in ms) used by the flanger - the actual delay at any given time is between this value and zero.
**Waveshape** | `CC-54` | Various waveshapes, triangle, square ...
**Invert** | `CC-49` | Invert the phase
## Building the Example
The faust code (.dsp) in this directory has been compiled using `faust2sam` into `flanger-sam`
```
% faust2sam -midi flanger.dsp
```
The result of this compile is a zip file `flanger-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
```
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