@Videoimpressions0622 I just took a look and it seems that the higher versions deliberately hide them. I also couldn't find them directly in the internal preferences of VP23.

Fortunately, however, Script API in higher versions allows you to access and edit preferences. Here's the script I wrote for you:

using System.Drawing;
using System.Windows.Forms;

using ScriptPortal.Vegas;

namespace Test
{
    public class TestClass
    {
        public Vegas myVegas;
        int valueVideo = 0, valueAudio = 0;
        public void Main(Vegas vegas)
        {
            myVegas = vegas;
            myVegas.ResumePlaybackOnScriptExit = true;

            // get values
            TPreferenceIntType preferenceVideo = TPreferenceIntType.TPT_eDefEnvVideoASRType;
            TPreferenceIntType preferenceAudio = TPreferenceIntType.TPT_eDefEnvAudioASRType;
            valueVideo = myVegas.GetPreference(preferenceVideo);
            valueAudio = myVegas.GetPreference(preferenceAudio);

            if (ShowWindow())
            {
                // set values
                myVegas.SetPreference(preferenceVideo, valueVideo);
                myVegas.SetPreference(preferenceAudio, valueAudio);
            }
        }

        public bool ShowWindow()
        {
            Form form = new Form
            {
                ShowInTaskbar = false,
                AutoSize = true,
                BackColor = Color.FromArgb(45, 45, 45),
                ForeColor = Color.FromArgb(200, 200, 200),
                Font = new Font("Arial", 9),
                Text = "EnvASRType Edit",
                FormBorderStyle = FormBorderStyle.FixedToolWindow,
                StartPosition = FormStartPosition.CenterScreen,
                AutoSizeMode = AutoSizeMode.GrowAndShrink
            };

            Panel p = new Panel
            {
                AutoSize = true,
                AutoSizeMode = AutoSizeMode.GrowAndShrink
            };
            form.Controls.Add(p);

            TableLayoutPanel l = new TableLayoutPanel
            {
                AutoSize = true,
                AutoSizeMode = AutoSizeMode.GrowAndShrink,
                GrowStyle = TableLayoutPanelGrowStyle.AddRows,
                ColumnCount = 2
            };
            p.Controls.Add(l);

            Label label = new Label
            {
                Margin = new Padding(12, 9, 6, 6),
                Text = "Video",
                AutoSize = true
            };
            l.Controls.Add(label);

            TextBox videoBox = new TextBox
            {
                AutoSize = true,
                Margin = new Padding(6, 6, 6, 6),
                Text = valueVideo.ToString(),
                Dock = DockStyle.Fill
            };
            l.Controls.Add(videoBox);

            label = new Label
            {
                Margin = new Padding(12, 9, 6, 6),
                Text = "Audio",
                AutoSize = true
            };
            l.Controls.Add(label);

            TextBox audioBox = new TextBox
            {
                AutoSize = true,
                Margin = new Padding(6, 6, 6, 6),
                Text = valueAudio.ToString(),
                Dock = DockStyle.Fill
            };
            l.Controls.Add(audioBox);

            FlowLayoutPanel panel = new FlowLayoutPanel
            {
                AutoSize = true,
                AutoSizeMode = AutoSizeMode.GrowAndShrink,
                Anchor = AnchorStyles.None,
                Font = new Font("Arial", 8)
            };
            l.Controls.Add(panel);
            l.SetColumnSpan(panel, 2);

            Button ok = new Button
            {
                Text = "OK",
                DialogResult = DialogResult.OK
            };
            panel.Controls.Add(ok);
            form.AcceptButton = ok;

            DialogResult result = form.ShowDialog(myVegas.MainWindow);

            int tmp = 0;
            valueVideo = int.TryParse(videoBox.Text, out tmp) ? tmp : valueVideo;
            valueAudio = int.TryParse(audioBox.Text, out tmp) ? tmp : valueAudio;

            return result == DialogResult.OK;
        }
    }
}

public class EntryPoint
{
    public void FromVegas(Vegas vegas)
    {
        Test.TestClass test = new Test.TestClass();
        test.Main(vegas);
    }
}

For VP23, the default values are 4 for video & 2 for audio. If you like Linear, change them to 1 & 1, and so on.

By the way, is there anyone else who needs an internal preferences editor like this? I might write a complete one later instead of using the one that comes with VEGAS Pro.