single channel GUI example added.

examples/gui/README.md

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+## About
+
+A single channel GUI demonstrating controls for the first virtual strip if Voicemeeter Banana.
+
+This example demonstrates (to an extent) two way communication. 
+-   Sending parameters values to the Voicemeeter driver.
+-   Receiving level updates
+
+Parameter updates (pdirty) events are not being received so changing a UI element on the main Voicemeeter app will not be reflected in the example GUI.
+
+## Use
+
+Simply run the script and try the controls.

examples/gui/__main__.py

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+import logging
+
+import vban_cmd
+
+logging.basicConfig(level=logging.DEBUG)
+import tkinter as tk
+from tkinter import ttk
+
+
+class App(tk.Tk):
+    def __init__(self, vban):
+        super().__init__()
+        self.vban = vban
+        self.title(f"{vban} - version {vban.version}")
+        self.vban.observer.add(self.on_ldirty)
+
+        # create widget variables
+        self.button_var = tk.BooleanVar(value=vban.strip[3].mute)
+        self.slider_var = tk.DoubleVar(value=vban.strip[3].gain)
+        self.meter_var = tk.DoubleVar(value=self._get_level())
+        self.gainlabel_var = tk.StringVar(value=self.slider_var.get())
+
+        # initialize style table
+        self.style = ttk.Style()
+        self.style.theme_use("clam")
+        self.style.configure(
+            "Mute.TButton", foreground="#cd5c5c" if vban.strip[3].mute else "#5a5a5a"
+        )
+
+        # create labelframe and grid it onto the mainframe
+        self.labelframe = tk.LabelFrame(text=self.vban.strip[3].label)
+        self.labelframe.grid(padx=1)
+
+        # create slider and grid it onto the labelframe
+        slider = ttk.Scale(
+            self.labelframe,
+            from_=12,
+            to_=-60,
+            orient="vertical",
+            variable=self.slider_var,
+            command=lambda arg: self.on_slider_move(arg),
+        )
+        slider.grid(
+            column=0,
+            row=0,
+        )
+
+        # create level meter and grid it onto the labelframe
+        level_meter = ttk.Progressbar(
+            self.labelframe,
+            orient="vertical",
+            variable=self.meter_var,
+            maximum=72,
+            mode="determinate",
+        )
+        level_meter.grid(column=1, row=0)
+
+        # create gainlabel and grid it onto the labelframe
+        gainlabel = ttk.Label(self.labelframe, textvariable=self.gainlabel_var)
+        gainlabel.grid(column=0, row=1, columnspan=2)
+
+        # create button and grid it onto the labelframe
+        button = ttk.Button(
+            self.labelframe,
+            text="Mute",
+            style="Mute.TButton",
+            command=lambda: self.on_button_press(),
+        )
+        button.grid(column=0, row=2, columnspan=2, padx=1, pady=2)
+
+    # define callbacks
+
+    def on_slider_move(self, *args):
+        val = round(self.slider_var.get(), 1)
+        self.vban.strip[3].gain = val
+        self.gainlabel_var.set(val)
+
+    def on_button_press(self):
+        self.button_var.set(not self.button_var.get())
+        self.vban.strip[3].mute = self.button_var.get()
+        self.style.configure(
+            "Mute.TButton", foreground="#cd5c5c" if self.button_var.get() else "#5a5a5a"
+        )
+
+    def _get_level(self):
+        val = max(self.vban.strip[3].levels.prefader)
+        return 0 if self.button_var.get() else 72 + val - 12 + self.slider_var.get()
+
+    def on_ldirty(self):
+        self.meter_var.set(self._get_level())
+
+
+def main():
+    with vban_cmd.api("banana", ldirty=True) as vban:
+        app = App(vban)
+        app.mainloop()
+
+
+if __name__ == "__main__":
+    main()