Matlab, Audio Toolbox, Live Audio Tuning Problem with Plugin: How do I handle more than one property?

I want to implement an plugin with multiple properties. I want to controll every property on its own via a slider. I create my UI with parameterTuner(). I have no problem implementing one property, for example gain (see my code below). I understand, that the functionality is implemented in the process funtion. I also understand, that the sliders are specified in audioPluginInterface(). I can create the sliders i want, but i dont get how i can add functionality to more than one slider. Using the (i think requiered) process function which hosts the slider functionaliy, i can only add functionality to one slider. I need to know how i can add functionality to additional sliders (or knobs, etc).

This is my Plugin Code. I am currently able to adjust my gain property and now i want to have a seperate, additional slider to adjust my stereo width.

classdef VoicePlugin < audioPlugin
    properties
        Gain = 1;
        Width = 1;
    end
    properties (Constant)
        PluginInterface = audioPluginInterface(audioPluginParameter('Gain',... %gain slider AllREADY IMPLEMTED
            'DisplayName','Gain', ...
            'Mapping',{'lin',-48,12}, ...
            'Layout',[1,1], ...
            'Style','vslider'), ...
            audioPluginParameter('Width', ... %stereo width slider I WANT TO IMPLEMENT FUNCTIONALITY FOR THIS SLIDER
            'DisplayName','Width', ...
            'Mapping',{'pow',2,0,4},...
            'Layout', [1,2],...
            'Style','vslider'),...
            audioPluginGridLayout('RowHeight',[300,20],'ColumnWidth', [100,100]));
    end
    methods
%functionality for gain slider
        function out = process(plugin, in)
            linAmp = 10 ^ (plugin.Gain/20); 
            out = in * linAmp;
        end
        
%HOW DO I IMPLEMENT THIS FUNCTIONALITY FOR MY WIDTH SLIDER??
%             x = [in(:,1) + in(:,2), in(:,1) - in(:,2)];            
%             y = [x(:,1), x(:,2)*plugin.Width];                      
%             out = [(y(:,1) + y(:,2))/2, (y(:,1) - y(:,2))/2];      
            
        function reset(plugin)
            plugin.Gain = 1;
%             plugin.Width = 1;
        end
        function set.Gain(plugin, val)
            plugin.Gain = val;
        end
%         function set.Width(plugin, val)
%             plugin.Width = val;
%         end
    end
end

This is the code of my main programm which uses the plugin, to tune input audio live.

%main script

deviceReader = audioDeviceReader(16000,1000); %sample rate (frames per sec), samples per frame
%deviceReader.ChannelMappingSource = 'Property' %use two channels
setup(deviceReader);
deviceWriter = audioDeviceWriter('SampleRate',deviceReader.SampleRate);

plugin = VoicePlugin();
controllGain = parameterTuner(plugin);
drawnow

%pause(1)
% scope = timescope()
disp('Begin Signal Input...')

%tic
while ishandle(controllGain)
    mySignal = deviceReader(); %mySignal is a matrix, rows = samples per frame, columns = audio channels
    
    myProcessedSignal = process(plugin, mySignal); 
    
    deviceWriter(myProcessedSignal);
%   scope(myProcessedSignal);
%   break;
    drawnow limitrate
end
disp('End Signal Input')

release(deviceReader)
release(deviceWriter)

Thank you in advance!

Answer 1

[jibrahim]

Hi Laurids,

The process function defines how the output is computed based on the input and plugin property values. Maybe I am miunderstanding your issue, but something like this should wrok (it is up to you to change the process code to do what you want):

classdef VoicePlugin < audioPlugin
    properties
        Gain = 1;
        Width = 1;
    end
    properties (Constant)
        PluginInterface = audioPluginInterface(audioPluginParameter('Gain',... 
            'DisplayName','Gain', ...
            'Mapping',{'lin',-48,12}, ...
            'Layout',[1,1], ...
            'Style','vslider'), ...
            audioPluginParameter('Width', ... 
            'DisplayName','Width', ...
            'Mapping',{'pow',2,0,4},...
            'Layout', [1,2],...
            'Style','vslider'),...
            audioPluginGridLayout('RowHeight',[300,20],'ColumnWidth', [100,100]));
    end
    methods
        
        function out = process(plugin, in)
            linAmp = 10 ^ (plugin.Gain/20); 
            x = [in(:,1) + in(:,2), in(:,1) - in(:,2)];            
            y = [x(:,1), x(:,2)*plugin.Width];                      
            out = linAmp * [(y(:,1) + y(:,2))/2, (y(:,1) - y(:,2))/2];      
        end         

        function set.Gain(plugin, val)
            plugin.Gain = val;
        end
        function set.Width(plugin, val)
            plugin.Width = val;
        end
    end
end