Select track by type (specifically all audio)?

I'm trying to select all audio tracks currently displayed in the edit window as part of a longer script...

In a real-world context; I often need to export all audio tracks as a track bounce however when I "Show Only Audio Tracks" folder tracks will also display... deselecting these is quite time consuming and leaves room for human error.

Any ideas on this?

I barely have a starting point for this.

I've tried to modify a script from @chrscheuer on this thread: "No Input" for all Audio Tracks #post-8

Here's as far as I've managed (however it's failing on line 4):

function isAudioTrack(trackName) {
    var track = sf.ui.proTools.trackGetByName({ name: trackName }).track;
    return track.title.value.indexOf('Audio Track') >= 0;
}

function getTrackWidth(trackName) {
    var track = sf.ui.proTools.trackGetByName({ name: trackName }).track;
    var width = track.groups.whoseTitle.is('Audio IO').first.sliders.whoseTitle.contains('Pan').count;
    return width;
}

function showAllTracks() {
    sf.ui.proTools.mainWindow.trackListPopupButton.popupMenuSelect({
        menuPath: ["Show Only","Audio Tracks"]
    });
    sf.ui.proTools.mainWindow.invalidate();
}

function setTrackHeightForAllTracks(size) {
    var track = sf.ui.proTools.visibleTrackHeaders[0];
    track.trackScrollToView();
    track.trackSelect();

    var f = track.frame;
    var popupMenu = track.popupMenuOpenFromElement({
        relativePosition: { x: f.w - 10, y: 5 },
        isOption: true,
    }).popupMenu;
    popupMenu.menuClickPopupMenu({
        menuPath: [size]
    });
}

function selectAllAudioTracksOfWidth(width) {
    var names = sf.ui.proTools.trackNames.filter(isAudioTrack).filter(t => getTrackWidth(t) === width);
    if (names.length === 0) return;
    sf.ui.proTools.trackGetByName({ name: names[0] }).track.trackScrollToView();
    sf.ui.proTools.trackSelectByName({
        names: names,
        deselectOthers: true
    });
}


function main() {
    sf.ui.proTools.appActivateMainWindow();

    //Make sure all tracks are shown
    showAllTracks();

    //Make sure all tracks are medium sized so we can read if they're mono or stereo
    setTrackHeightForAllTracks('medium');

    //Select all mono->mono tracks and set their input
    selectAllAudioTracksOfWidth(0);


    //Select all mono->X tracks and set their input
    selectAllAudioTracksOfWidth(1);


    //Select all stereo->X tracks and set their input
    selectAllAudioTracksOfWidth(2);

}

main();

Many thanks in advance!