How to use the easygui.multchoicebox function in easygui

def ShowOptions(option_list, title, header):
    choice = eg.multchoicebox(header , title, option_list)
    return choice

"None",]
            flashtransfer_settings = multchoicebox(msg, title, choices, preselect=None)
            print flashtransfer_settings
            # End preperation history
        
        # Interventions during capture
        msg ="Interventions at point of capture"
        title = "capture interventions"
        choices = ["Exposure compensation",
                   "Contrast adjustment",
                   "Negative to positive", 
                   "Spacing between reels not captured",
                   "Monochrome setting enabled",
                   "Overscanning of image to capture optical track"
                    ]
        capture_interventions = multchoicebox(msg, title, choices, preselect=None)
        # End interventions during capture
        if not workflow == "Scanning":
            # Audio assesment during capture
            msg ="Headphones/speakers used during capture"
            title = "capture audio assesment"
            choices = ["Philips Headphones",
                       "M-Audio Speakers",
                       "Both",
                       "None"                   
                   
                        ]
            audio_choices = choicebox(msg, title, choices)

            if audio_choices == "Philips Headphones":
                def audio_capture_telecine(number):
                    philips_headphones_telecine(number)

def createProtocol(preselected_channels=False, preselected_powers=None):
    electrodes=[]
    powers=[]
    outcomes=[]
    anodeChoice=eg.multchoicebox(title="Select electrodes", msg="Select the locations that you want to recieve stimulation. You can set them as anodes or cathodes in the next step.", choices=['F4','C4','O2','C3','F3','O1'])
    if anodeChoice:
        for item in anodeChoice:
            electrodes.append(stimModes[item])
        choices=anodeChoice
        choices.append("Ramp up/down duration (set to 0 for no ramping)")
        choices.append("Stimulation duration (minutes)")
        choices.append("Sham probability(set to 0 for no sham trials")
        choices.append("Frequency (set to 0 for dc stimulation)")
        powers=eg.multenterbox("Enter the power that should be used for each electrode. Positive values represent anodal stimulation, and negative values represent cathodal stimulation. You can also set the duration, ramping parameters, and sham probability of the protocol","Stimulation parameters",choices)
        if powers:
            exMode=eg.ynbox(title="Outcome measures",msg="Do you want to add outcome measures to this protocol?")
            if exMode:
                
                outcomes=[]
                selected=""
                keepPrompting=True

print audio_choices       
              
        
        # End interventions during capture
        msg ="Post Processing?"
        title = "Post Processing"
        choices = ["Horizontal Flipping",
                   "Vertical Flipping",
                   "Audio normalised to -20db", 
                   "Broadcast Safe Filter",
                   "Desaturate Filter",
                   "Negative to positive",
                   "Avid Motion Editing",
                   "None"
                   ]
        post_processing = multchoicebox(msg, title, choices, preselect=None)

    #More interviews    
    msg ="User?"
    title = "Pick a name yo!"
    choices = ["Kieran O'Leary", "Gavin Martin", 
               "Dean Kavanagh", "Raelene Casey", 
           "Anja Mahler", "Eoin O'Donohoe", "Brian Cash","Unknown"]
    user = choicebox(msg, title, choices)

    msg = "Fill out these things please"
    title = "blablablabl"
    fieldNames = ["Source Accession Number",
                  "Filmographic Reference Number", 
                  "Identifier-Object Entry/Accession Number:"]
      # we start with blanks for the values
    fieldValues = multenterbox(msg,title, fieldNames)

print preparation
        # End preperation history
        # Flashtransfer settings  
        flashtransfer_settings = []   
        if scanner == "Flashtransfer": 
            msg ="Flashtransfer settings?"
            title = "Workflows"
            choices = ["Gamma Curve - Linear",
                       "Gamma Curve - Low",
                       "Gamma Curve - Standard", 
                       "Gamma Curve - High",
                       "Contrast - Low",
                       "Contrast - Off",
                       "Contrast - High",
                       "None",]
            flashtransfer_settings = multchoicebox(msg, title, choices, preselect=None)
            print flashtransfer_settings
            # End preperation history
        
        # Interventions during capture
        msg ="Interventions at point of capture"
        title = "capture interventions"
        choices = ["Exposure compensation",
                   "Contrast adjustment",
                   "Negative to positive", 
                   "Spacing between reels not captured",
                   "Monochrome setting enabled",
                   "Overscanning of image to capture optical track"
                    ]
        capture_interventions = multchoicebox(msg, title, choices, preselect=None)
        # End interventions during capture
        if not workflow == "Scanning":

add_to_revtmd('//revtmd:codingProcessHistory' + str([number]) + '/revtmd:manufacturer', 'P&S Techniks', revtmd_xmlfile)
                add_to_revtmd('//revtmd:codingProcessHistory' + str([number]) + '/revtmd:modelName', 'Steadyframe', revtmd_xmlfile)
                add_to_revtmd('//revtmd:codingProcessHistory' + str([number]) + '/revtmd:signal', 'Ethernet', revtmd_xmlfile)
                
                
        # Preparation History        
        msg ="Preperation?"
        title = "Workflows"
        choices = ["Splice and perforation assessment",
                   "Splice repairs",
                   "Leader added", 
                   "Perforation repairs",
                   "Recanned",
                   "Cleaning",
                   "Mould removal"]
        preparation = multchoicebox(msg, title, choices, preselect=None)
        print preparation
        # End preperation history
        # Flashtransfer settings  
        flashtransfer_settings = []   
        if scanner == "Flashtransfer": 
            msg ="Flashtransfer settings?"
            title = "Workflows"
            choices = ["Gamma Curve - Linear",
                       "Gamma Curve - Low",
                       "Gamma Curve - Standard", 
                       "Gamma Curve - High",
                       "Contrast - Low",
                       "Contrast - Off",
                       "Contrast - High",
                       "None",]
            flashtransfer_settings = multchoicebox(msg, title, choices, preselect=None)