diff --git a/ch32v-insert-coin/src/app.rs b/ch32v-insert-coin/src/app.rs
index 720cb25..fb7e0fc 100644
--- a/ch32v-insert-coin/src/app.rs
+++ b/ch32v-insert-coin/src/app.rs
@@ -459,7 +459,8 @@ impl App {
 
         if self.services.synth0.need_service() {
             let out = match self.services.synth0.service() {
-                Some(value) => value / self.settings.volume.as_volume_divisor(),
+                Some(value) => value / 4,
+                // Some(value) => value / self.settings.volume.as_volume_divisor(),
                 None => 0,
             };
             self.interfaces
@@ -469,7 +470,7 @@ impl App {
 
         if self.services.sample_player.need_service() {
             self.services.sample_player.service();
-            let out = self.services.sample_player.get_amplitude();
+            let out = self.services.sample_player.get_amplitude() / 3;
             self.interfaces
                 .pwm_core
                 .write_amplitude(ch32_hal::timer::Channel::Ch4, out as u8);
@@ -566,12 +567,13 @@ impl App {
 }
 
 // TODO LIST
+// BROKEN:
+// 1. audio scaling causes crash
+// 2. popping on sample playback
+// 3. actual app sequence (start at idle?)
 //
 // AUDIO:
-// 2. dac switching
 // 3. amp_en control
-// 4. write sequences
-// 6. multiple sequences
 //
 // LED:
 //
diff --git a/ch32v-insert-coin/src/main.rs b/ch32v-insert-coin/src/main.rs
index b3aa5ae..dac3140 100644
--- a/ch32v-insert-coin/src/main.rs
+++ b/ch32v-insert-coin/src/main.rs
@@ -31,7 +31,7 @@ use insert_coin::{CoreConfig, DacService, InsertCoin, LedService, SimplePwmCore}
 use ch32_hal as hal;
 use hal::bind_interrupts;
 use hal::delay::Delay;
-use hal::gpio::{AnyPin, Input, Pin, Pull};
+use hal::gpio::{AnyPin, Input, Level, Output, Pin, Pull};
 use hal::time::Hertz;
 use hal::timer::low_level::CountingMode;
 use hal::timer::simple_pwm::{PwmPin, SimplePwm};
@@ -190,8 +190,9 @@ fn app_main(mut p: hal::Peripherals) -> ! {
         CountingMode::default(),
     );
 
-    pwm.set_polarity(led0_ch, OutputPolarity::ActiveLow);
+    pwm.set_polarity(led0_ch, OutputPolarity::ActiveHigh);
     pwm.set_polarity(led1_ch, OutputPolarity::ActiveLow);
+    pwm.set_polarity(led2_ch, OutputPolarity::ActiveLow);
 
     let tick_rate_hz = 50000;
 
@@ -224,8 +225,11 @@ fn app_main(mut p: hal::Peripherals) -> ! {
     let extra_io_1 = p.PD0;
     let extra_io_2 = p.PD3;
 
+    let mut amp_en_output = Output::new(amp_en, Level::Low, Default::default());
+    amp_en_output.set_low();
+
     // set up interrupts
-    unsafe { system::init_gpio_irq(sense_coin_pin.pin(), sense_coin_pin.port(), false, true) };
+    unsafe { system::init_gpio_irq(sense_coin_pin.pin(), sense_coin_pin.port(), true, false) };
     unsafe { system::init_gpio_irq(main_btn_pin.pin(), main_btn_pin.port(), true, true) };
 
     // coin debouncer (100ms)
@@ -247,8 +251,8 @@ fn app_main(mut p: hal::Peripherals) -> ! {
         batt_adc_timer_ms: 10000,
         usb_adc_timer_ms: 10000,
         led0_timer_ms: 100,
-        led1_timer_ms: 300,
-        led2_timer_ms: 1100,
+        led1_timer_ms: 100,
+        led2_timer_ms: 100,
     };
 
     let app_config = Config {
@@ -460,9 +464,9 @@ fn main() -> ! {
     let mut p = hal::init(config);
 
     // delay to let the debugger attach
-    println!("pre");
+    // println!("pre");
     riscv::asm::delay(20_000_000);
-    println!("post");
+    // println!("post");
     // debug_main(p);
 
     app_main(p);