diff --git a/src/instr_fm.cc b/src/instr_fm.cc
index e2eff4c..ddd43de 100644
--- a/src/instr_fm.cc
+++ b/src/instr_fm.cc
@@ -51,7 +51,7 @@ namespace Heck {
         }
 
         void FM::switch_mode(unsigned int pos) {}
-        void FM::swtich_variation(unsigned int pos) {}
+        void FM::switch_variation(unsigned int pos) {}
         void FM::switch_filter(unsigned int pos) {}
 
         float FM::nextsample()
diff --git a/src/instr_fm.hh b/src/instr_fm.hh
index 0c6b1d2..10c1610 100644
--- a/src/instr_fm.hh
+++ b/src/instr_fm.hh
@@ -18,7 +18,7 @@ namespace Heck {
             void trigger() override;
             void ctl(unsigned int ctl_nr, float val) override;
             void switch_mode(unsigned int pos) override;
-            void swtich_variation(unsigned int pos) override;
+            void switch_variation(unsigned int pos) override;
             void switch_filter(unsigned int pos) override;
 
             float nextsample() override;
diff --git a/src/instr_kick.cc b/src/instr_kick.cc
index cb88f23..7624622 100644
--- a/src/instr_kick.cc
+++ b/src/instr_kick.cc
@@ -37,7 +37,7 @@ namespace Heck {
 
         void Kick::ctl(unsigned int ctl_nr, float val) {}
         void Kick::switch_mode(unsigned int pos) {}
-        void Kick::swtich_variation(unsigned int pos) {}
+        void Kick::switch_variation(unsigned int pos) {}
         void Kick::switch_filter(unsigned int pos) {}
 
         float Kick::nextsample()
diff --git a/src/instr_kick.hh b/src/instr_kick.hh
index 1edb688..edc4e56 100644
--- a/src/instr_kick.hh
+++ b/src/instr_kick.hh
@@ -18,7 +18,7 @@ namespace Heck {
             void trigger() override;
             void ctl(unsigned int ctl_nr, float val) override;
             void switch_mode(unsigned int pos) override;
-            void swtich_variation(unsigned int pos) override;
+            void switch_variation(unsigned int pos) override;
             void switch_filter(unsigned int pos) override;
 
             float nextsample() override;
diff --git a/src/instr_noise.cc b/src/instr_noise.cc
index 965225c..25937ac 100644
--- a/src/instr_noise.cc
+++ b/src/instr_noise.cc
@@ -24,7 +24,7 @@ namespace Heck {
 
         void Noise::ctl(unsigned int ctl_nr, float val) {}
         void Noise::switch_mode(unsigned int pos) {}
-        void Noise::swtich_variation(unsigned int pos) {}
+        void Noise::switch_variation(unsigned int pos) {}
         void Noise::switch_filter(unsigned int pos) {}
 
         float Noise::nextsample()
diff --git a/src/instr_noise.hh b/src/instr_noise.hh
index 7a81b32..6beaeb2 100644
--- a/src/instr_noise.hh
+++ b/src/instr_noise.hh
@@ -18,7 +18,7 @@ namespace Heck {
             void trigger() override;
             void ctl(unsigned int ctl_nr, float val) override;
             void switch_mode(unsigned int pos) override;
-            void swtich_variation(unsigned int pos) override;
+            void switch_variation(unsigned int pos) override;
             void switch_filter(unsigned int pos) override;
 
             float nextsample() override;
diff --git a/src/perkons_instrument_interface.hh b/src/perkons_instrument_interface.hh
index b703b85..67d20e6 100644
--- a/src/perkons_instrument_interface.hh
+++ b/src/perkons_instrument_interface.hh
@@ -11,7 +11,7 @@ public:
 
     // pos must be either 0,1,2
     virtual void switch_mode(unsigned int pos) = 0;
-    virtual void swtich_variation(unsigned int pos) = 0;
+    virtual void switch_variation(unsigned int pos) = 0;
     virtual void switch_filter(unsigned int pos) = 0;
     virtual float nextsample() = 0;