update all to use TuiOutput; still slow?

crates/tek_mixer/src/mixer_main.rs

@@ -1,5 +1,30 @@
 //! Multi-track mixer
 include!("lib.rs");
+use tek_core::clap::{self, Parser};
+#[derive(Debug, Parser)]
+#[command(version, about, long_about = None)]
+pub struct MixerCli {
+    /// Name of JACK client
+    #[arg(short, long)] name: Option<String>,
+    /// Number of tracks
+    #[arg(short, long)] channels: Option<usize>,
+}
+impl<E: Engine> Mixer<E> {
+    pub fn from_args () -> Usually<Self> {
+        let args = MixerCli::parse();
+        let mut mix = Self::new("")?;
+        if let Some(name) = args.name {
+            mix.name = name.clone();
+        }
+        if let Some(channels) = args.channels {
+            for channel in 0..channels {
+                mix.track_add(&format!("Track {}", channel + 1), 1)?;
+            }
+        }
+        Ok(mix)
+    }
+}
+
 pub fn main () -> Usually<()> {
     Tui::run(Arc::new(RwLock::new(crate::Mixer::from_args()?)))?;
     Ok(())