a second instance on one machine: its own data, its own peer port, and a join that says itself again when it was never seated

src-tauri/src/lib.rs

@@ -15,6 +15,7 @@ mod loudness;
 mod lyric_align;
 mod lyric_prep;
 mod lyrics;
+mod paths;
 mod pipeline;
 mod playback;
 mod profile;
@@ -344,7 +345,10 @@ pub fn run() {
                  --enable-smooth-scrolling \
                  --force-color-profile=srgb";
             #[cfg(debug_assertions)]
-            let args = format!("{base} --remote-debugging-port=9222");
+            // A second instance needs its own CDP port, or it silently fails
+            // to bind and cannot be driven at all.
+            let cdp = std::env::var("SOULSTREAM_CDP_PORT").unwrap_or_else(|_| "9222".into());
+            let args = format!("{base} --remote-debugging-port={cdp}");
             #[cfg(not(debug_assertions))]
             let args = base.to_string();
             for window in &mut context.config_mut().app.windows {