How to select all mono or stereo tracks?

If you only need to distinguish between mono and stereo tracks, you can try this:

function isAudioTrack(trackName) {
    var track = sf.ui.proTools.trackGetByName({ name: trackName }).track;
    if (!track) return;
    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 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
    });
}

//To select all mono audio tracks
//selectAllAudioTracksOfWidth(1);

//To select all stereo audio tracks
selectAllAudioTracksOfWidth(2);