diff --git a/rust-whisper-baked-lib-wasm/src/lib.rs b/rust-whisper-baked-lib-wasm/src/lib.rs
index 10bd1f1..a8944ef 100644
--- a/rust-whisper-baked-lib-wasm/src/lib.rs
+++ b/rust-whisper-baked-lib-wasm/src/lib.rs
@@ -2,16 +2,34 @@ use wasm_bindgen::prelude::*;
 use rust_whisper_lib;
 use rust_whisper_baked_lib;
 
+#[wasm_bindgen]
+extern {
+    pub fn whisper_on_success(s: String);
+    pub fn whisper_on_error(s: String);
+}
+
 #[wasm_bindgen]
 pub fn listen(
-   flags: rust_whisper_lib::Flags,
-   on_success: fn(String),
-   on_error: fn(String),
+   stream_step: Option<u64>,
+   stream_retain: Option<f32>,
+   stream_head: Option<f32>,
+   stream_tail: Option<f32>,
 ) {
+   let flags = rust_whisper_lib::Flags {
+      model_path: None,
+      model_buffer: None,
+      threads: 4,
+      stream_step: stream_step.unwrap_or(5),
+      stream_retain: stream_retain.unwrap_or(1.0),
+      stream_head: stream_head.unwrap_or(0.5),
+      stream_tail: stream_tail.unwrap_or(0.5),
+      wav: None,
+      debug: false,
+   };
    rust_whisper_baked_lib::main(flags, |result| {
       match result {
-         Ok(msg) => on_success(msg.to_string()),
-         Err(msg) => on_error(msg),
+         Ok(msg) => whisper_on_success(msg.to_string()),
+         Err(msg) => whisper_on_error(msg),
       };
    });
 }