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======MIDI Controlled Volume on Core 1======

A first example to demonstrate the workflow is a simple MIDI controlled stereo volume control that runs on Core 1.

===== The Faust Code for the MIDI Controlled Volume =====

Here is the Faust code for the MIDI controlled stereo volume. Note that the metadata string “[midi:ctrl 2]” is used to map MIDI continuous controller 2 (CC-2) to control the gain slider.

<WRAP clear/>

<code c>
//---------------------------------------------------------
// Volume control in dB with MIDI control (CC-1, modWheel)
//---------------------------------------------------------

import("stdfaust.lib");

gain		=  vslider("Volume[midi:ctrl 2] [tooltip CC-1]", 0, -70, +4, 0.1) : ba.db2linear : si.smoo;

process		= _,_: *(gain), *(gain);
</code>

===== Building a Test GUI for the MIDI Controlled Volume =====

  * Open the Faust [[https://faust.grame.fr/editor|online editor]].
  * Name the *.dsp file volume.dsp.
  * Copy the algorithm above into the online editor.
  * Compile and run the Faust program using the {{:resources:tools-software:sharc-audio-module:faust:play_button.png?nolink&50|}} button

{{:resources:tools-software:sharc-audio-module:faust:volume1.gif?nolink&600|}}

===== Looking at the Block Diagram for the MIDI Controlled Volume =====

The block diagram button {{:resources:tools-software:sharc-audio-module:faust:diagram_button.png?nolink&50|}} can be used to generate a hierarchical block diagram for an algorithm. 
<note>You may need to allow pop-ups in your browser to view the block diagram</note>
This block diagram is hierarchical. Here are a few of the hierarchical levels:

{{:resources:tools-software:sharc-audio-module:/faust8.png?312x254}}

===== Creating Files for use with the Baremetal Framework =====

{{:resources:tools-software:sharc-audio-module:faust:volume2.gif?nolink&600|}}

  * Click the ''Export/compile to a specific platform'' button {{:resources:tools-software:sharc-audio-module:faust:export_button.png?nolink&50|}}
  * In the first dropdown box, choose ''sam''
  * In the second dropdown box, choose ''sam-source-midi'' and then ''Export'':
<note>**faust2sam** will generate the following three %%C++%% source files, which is the algorithm.
    * ''fast_pow2.h''
    * ''samFaustDSP.cpp''
    * ''samFaustDSP.h''
</note>
  * Click on the QR code that shows to download the files
  * These 3 source files can be copied to the Faust directory in the CCES framework. The framework can then be compiled and downloaded to the SHARC Audio Module.
  * See [[resources:tools-software:sharc-audio-module:faust#faust_with_the_cces_bare_metal_framework|Faust with the CCES Bare Metal Framework]] for more information

===Expected Effect===
When you run the project through the debugger, you will be able to control the volume by turning the POT labeled ''HADC0''.

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{{navigation SHARC Audio Module#..hardware|Hardware Reference#.|Faust and the SHARC Audio Module#ex-work-reverb|MIDI Controlled Referb}}
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