diff --git a/ch32v-insert-coin/src/app.rs b/ch32v-insert-coin/src/app.rs
index 17c2a77..b1befab 100644
--- a/ch32v-insert-coin/src/app.rs
+++ b/ch32v-insert-coin/src/app.rs
@@ -124,7 +124,7 @@ pub mod sequencer {
                 ticks_remaining: 0,
                 num_loops: 1,
                 loop_count: 0,
-                enabled: true,
+                enabled: false,
             }
         }
 
@@ -132,6 +132,9 @@ pub mod sequencer {
             self.sequence = sequence;
             self.num_loops = num_loops;
             self.loop_count = 0;
+            self.enabled = true;
+            self.index = 0;
+            self.ticks_remaining = 0;
         }
 
         pub fn enable(&mut self) {
@@ -343,6 +346,7 @@ impl App {
         self.timers.led2_timer.enable(true);
 
         self.services.synth0.set_freq(440);
+        self.services.synth0.disable();
     }
 
     pub fn set_state(&mut self, state: State) {
@@ -455,10 +459,10 @@ impl App {
 
         if self.services.sample_player.need_service() {
             self.services.sample_player.service();
-            // let out = self.services.sample_player.get_amplitude();
-            // self.interfaces
-            //     .pwm_core
-            //     .write_amplitude(ch32_hal::timer::Channel::Ch4, out as u8);
+            let out = self.services.sample_player.get_amplitude();
+            self.interfaces
+                .pwm_core
+                .write_amplitude(ch32_hal::timer::Channel::Ch4, out as u8);
         }
     }
 }
@@ -504,7 +508,7 @@ impl App {
         self.timers.sp_timer.reset();
         self.timers.lp_timer.reset();
     }
-    pub fn coin_detect(&self) {
+    pub fn coin_detect(&mut self) {
         #[cfg(feature = "enable_print")]
         println!("coin detect");
         self.services.sample_player.play_sample();
@@ -513,10 +517,16 @@ impl App {
 
 // Events
 impl App {
-    fn main_button_click(&self) {
+    fn main_button_click(&mut self) {
         // TODO
         #[cfg(feature = "enable_print")]
         println!("click");
+        self.services.sequencer.play_sequence(&crate::TEST_SEQ, 1);
+        self.services.synth0.enable();
+
+        // TODO:
+        // this is a hack to stop the coin thing from playing.
+        self.services.sample_player.disable();
     }
     fn main_button_short_press(&self) {
         // TODO
@@ -543,6 +553,8 @@ impl App {
 // AUDIO:
 // 2. dac switching
 // 3. amp_en control
+// 4. write sequences
+// 5. sample player start disabled
 //
 // LED:
 //
@@ -559,3 +571,4 @@ impl App {
 // 1. clean up edge detector
 // 2. better handling for pwm scaling (brightness / volume)
 // 3. better interrupt handling structs
+// 4. led DynamicSequence
diff --git a/ch32v-insert-coin/src/insert_coin/services/dac.rs b/ch32v-insert-coin/src/insert_coin/services/dac.rs
index 1d18994..d262a14 100644
--- a/ch32v-insert-coin/src/insert_coin/services/dac.rs
+++ b/ch32v-insert-coin/src/insert_coin/services/dac.rs
@@ -8,6 +8,7 @@ pub struct DacService<'a> {
     dpcm_decoder: core::cell::RefCell<DpcmDecoder<'a>>,
     amplitude: core::cell::RefCell<usize>,
     pub channel: Channel,
+    enabled: bool,
 }
 
 impl<'a> DacService<'a> {
@@ -17,11 +18,17 @@ impl<'a> DacService<'a> {
             dpcm_decoder: core::cell::RefCell::new(DpcmDecoder::new()),
             amplitude: core::cell::RefCell::new(0),
             channel,
+            enabled: false,
         }
     }
 
-    pub fn play_sample(&self) {
+    pub fn play_sample(&mut self) {
         self.dpcm_decoder.borrow_mut().seek_to_sample(0);
+        self.enabled = true;
+    }
+
+    pub fn disable(&mut self) {
+        self.enabled = false;
     }
 
     pub fn load_data(&self, data: &'a [u8]) {
@@ -39,12 +46,14 @@ impl<'a> DacService<'a> {
 
 impl<'a> TickService for DacService<'a> {
     fn tick(&self) {
-        let mut tc = self.service_data.borrow_mut();
-        tc.ticks_remaining = tc.ticks_remaining.saturating_sub(1);
+        if self.enabled {
+            let mut tc = self.service_data.borrow_mut();
+            tc.ticks_remaining = tc.ticks_remaining.saturating_sub(1);
+        }
     }
 
     fn need_service(&self) -> bool {
-        self.service_data.borrow().ticks_remaining == 0
+        self.enabled && self.service_data.borrow().ticks_remaining == 0
     }
 
     fn service(&self) {
diff --git a/ch32v-insert-coin/src/main.rs b/ch32v-insert-coin/src/main.rs
index c7e2368..9fc0841 100644
--- a/ch32v-insert-coin/src/main.rs
+++ b/ch32v-insert-coin/src/main.rs
@@ -39,7 +39,7 @@ use qingke::riscv;
 use crate::app::sequencer::{DynamicSequence, SequenceEntry};
 
 static LED0_SEQ: [u8; 8] = [0u8, 25u8, 50u8, 75u8, 100u8, 75u8, 50u8, 25u8];
-static TEST_SEQ: [app::sequencer::SequenceEntry; 2] = [
+pub static TEST_SEQ: [app::sequencer::SequenceEntry; 2] = [
     SequenceEntry {
         frequency_hz: 440,
         duration_ms: 1000,
@@ -267,7 +267,8 @@ 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/coin2.raw");
+    let coin_sound = include_bytes!("../audio/coin.raw");
+    // let coin_sound = include_bytes!("../audio/coin2.raw");
 
     let sample_player = DacService::new(ch32_hal::timer::Channel::Ch4, dac_service_data);
     sample_player.load_data(coin_sound);
diff --git a/ch32v-insert-coin/src/synthesizer.rs b/ch32v-insert-coin/src/synthesizer.rs
index d3cb3a1..810336e 100644
--- a/ch32v-insert-coin/src/synthesizer.rs
+++ b/ch32v-insert-coin/src/synthesizer.rs
@@ -34,10 +34,11 @@ impl SynthesizerService {
     }
 
     pub fn need_service(&self) -> bool {
-        self.need_service || self.synth.has_new_output()
+        self.need_service || (self.enabled && self.synth.has_new_output())
     }
 
     pub fn service(&mut self) -> Option<u8> {
+        self.need_service = false;
         if self.enabled {
             Some(self.synth.get_output())
         } else {