diff --git a/src/camera.rs b/src/camera.rs
index 12a6e4c..d752a65 100644
--- a/src/camera.rs
+++ b/src/camera.rs
@@ -541,16 +541,16 @@ pub fn apply_input_to_player(
         let right_factor = engine.thrust_sideways * engine.current_warmup;
         let up_factor = engine.thrust_sideways * engine.current_warmup;
         let factor = DVec3::new(right_factor as f64, up_factor as f64, forward_factor as f64);
+        let boost = if bike.is_none() {
+            engine.current_boost_factor
+        } else {
+            1.0
+        };
 
         if axis_input.length_squared() > 0.003 {
             engine.currently_firing = true;
             let acceleration_global: DVec3 =
                 DVec3::from(player_transform.rotation * (axis_input * factor).as_vec3());
-            let boost = if bike.is_none() {
-                engine.current_boost_factor
-            } else {
-                1.0
-            };
             let mut acceleration_total: DVec3 =
                 (actor::ENGINE_SPEED_FACTOR * dt) as f64 * boost * acceleration_global;
             let threshold = 1e-5;
@@ -687,21 +687,23 @@ pub fn apply_input_to_player(
         let sinks = vec![
             (
                 1.0,
+                boost as f32,
                 actor::EngineType::Monopropellant,
                 sinks.get(&audio::Sfx::Thruster),
             ),
-            (1.0, actor::EngineType::Ion, sinks.get(&audio::Sfx::Ion)),
+            (1.0, 1.0, actor::EngineType::Ion, sinks.get(&audio::Sfx::Ion)),
         ];
         let seconds_to_max_vol = 0.05;
         let seconds_to_min_vol = 0.05;
         for sink_data in sinks {
-            if let (vol_boost, engine_type, Some(sink)) = sink_data {
+            if let (vol_boost, speed, engine_type, Some(sink)) = sink_data {
                 if settings.mute_sfx {
                     sink.pause();
                 } else {
                     let volume = sink.volume();
                     if engine.engine_type == engine_type {
                         if play_thruster_sound {
+                            sink.set_speed(speed);
                             sink.play();
                             if volume < 1.0 {
                                 let maxvol = vol_boost;