diff --git a/.gitignore b/.gitignore
index 1a417612..a30778be 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,4 @@ perf.data*
 flamegraph*.svg
 vgcore*
 example.mid
+*/cov
diff --git a/Justfile b/Justfile
index ebecf465..ff7bc100 100644
--- a/Justfile
+++ b/Justfile
@@ -6,6 +6,8 @@ cloc:
   for src in {cli,edn/src,input/src,jack/src,midi/src,output/src,plugin/src,sampler/src,tek/src,time/src,tui/src}; do echo; echo $src; cloc --quiet $src; done
 test:
   cargo test --workspace --exclude jack
+cov:
+  CARGO_INCREMENTAL=0 RUSTFLAGS='-Cinstrument-coverage' LLVM_PROFILE_FILE='cov/cargo-test-%p-%m.profraw' cargo test --workspace --exclude jack
 prof:
   CARGO_PROFILE_RELEASE_DEBUG=true cargo flamegraph -- arranger
 status:
diff --git a/tek/src/view.rs b/tek/src/view.rs
index 64472938..6055b5ce 100644
--- a/tek/src/view.rs
+++ b/tek/src/view.rs
@@ -201,7 +201,7 @@ impl Tek {
         let w = self.w();
         let fg = Tui::g(224);
         let bg = Tui::g(64);
-        let mut h = 1 + self.midi_ins.len();
+        let mut h = 2.max(1 + self.midi_ins.len());
         for midi_in in self.midi_ins.iter() { h += midi_in.conn().len() }
         let conn = move|conn: &PortConnect|{
             Fill::x(Align::w(Tui::bold(false, Tui::fg_bg(fg, bg, conn.info()))))
@@ -231,7 +231,7 @@ impl Tek {
     fn view_outputs (&self) -> impl Content<TuiOut> + use<'_> {
         let fg = Tui::g(224);
         let bg = Tui::g(64);
-        let mut h = 1 + self.midi_outs.len();
+        let mut h = 2.max(1 + self.midi_outs.len());
         for midi_out in self.midi_outs.iter() { h += midi_out.conn().len() }
         let header: ThunkBox<_> = io_header!(
             self,
@@ -269,7 +269,10 @@ impl Tek {
             let bs = Style::default().fg(bfg).bg(bg);
             let cell = Bsp::e(
                 Tui::fg_bg(bg, bg2, "▐"),
-                Tui::fg_bg(fg, bg, Tui::bold(true, Fill::x(Align::nw(name)))));
+                Bsp::w(
+                    Tui::fg_bg(bg, Reset, "▌"),
+                    Tui::fg_bg(fg, bg, Tui::bold(true, Fill::x(Align::nw(name)))),
+                ));
             Outer(active, bs).enclose(cell)
         });
         self.view_row(self.w(), 1, header, cells)