diff --git a/ch32v-insert-coin/audio/coin3.raw b/ch32v-insert-coin/audio/coin3.raw
new file mode 100644
index 0000000..8c590d9
Binary files /dev/null and b/ch32v-insert-coin/audio/coin3.raw differ
diff --git a/ch32v-insert-coin/audio/coin4.raw b/ch32v-insert-coin/audio/coin4.raw
new file mode 100644
index 0000000..f350cd0
Binary files /dev/null and b/ch32v-insert-coin/audio/coin4.raw differ
diff --git a/ch32v-insert-coin/audio/coin5.raw b/ch32v-insert-coin/audio/coin5.raw
new file mode 100644
index 0000000..922bb2c
Binary files /dev/null and b/ch32v-insert-coin/audio/coin5.raw differ
diff --git a/ch32v-insert-coin/src/app.rs b/ch32v-insert-coin/src/app.rs
index 00b764e..9703585 100644
--- a/ch32v-insert-coin/src/app.rs
+++ b/ch32v-insert-coin/src/app.rs
@@ -470,7 +470,7 @@ impl App {
 
         if self.services.sample_player.need_service() {
             self.services.sample_player.service();
-            let out = self.services.sample_player.get_amplitude() / 3;
+            let out = self.services.sample_player.get_amplitude() / 2;
             self.interfaces
                 .pwm_core
                 .write_amplitude(ch32_hal::timer::Channel::Ch4, out as u8);
diff --git a/ch32v-insert-coin/src/insert_coin/services/dac.rs b/ch32v-insert-coin/src/insert_coin/services/dac.rs
index d262a14..0a3b364 100644
--- a/ch32v-insert-coin/src/insert_coin/services/dac.rs
+++ b/ch32v-insert-coin/src/insert_coin/services/dac.rs
@@ -59,6 +59,10 @@ impl<'a> TickService for DacService<'a> {
     fn service(&self) {
         let mut tc = self.service_data.borrow_mut();
         tc.ticks_remaining = tc.ticks_per_service;
-        self.set_amplitude(self.dpcm_decoder.borrow_mut().output_next());
+        if (self.dpcm_decoder.borrow().is_done()) {
+            self.set_amplitude(0);
+        } else {
+            self.set_amplitude(self.dpcm_decoder.borrow_mut().output_next());
+        }
     }
 }
diff --git a/ch32v-insert-coin/src/main.rs b/ch32v-insert-coin/src/main.rs
index c14a77a..d29f7d5 100644
--- a/ch32v-insert-coin/src/main.rs
+++ b/ch32v-insert-coin/src/main.rs
@@ -265,7 +265,7 @@ fn app_main(mut p: hal::Peripherals) -> ! {
     let dac_tick_per_service = tick_rate_hz / dac_sample_rate_hz;
     let dac_service_data = TickServiceData::new(dac_tick_per_service);
 
-    let coin_sound = include_bytes!("../audio/coin.raw");
+    let coin_sound = include_bytes!("../audio/coin5.raw");
     // let coin_sound = include_bytes!("../audio/coin2.raw");
 
     let sample_player = DacService::new(ch32_hal::timer::Channel::Ch4, dac_service_data);