diff --git a/footboard.ino b/footboard.ino
index 97a0f7d..5d68909 100644
--- a/footboard.ino
+++ b/footboard.ino
@@ -1,21 +1,10 @@
-
-
 char n_buttons = 7;
 char button_pins[] = {0, 1, 2, 3, 4, 5, 6};
 char pin_state[] = {HIGH, HIGH, HIGH, HIGH, HIGH, HIGH, HIGH};
 
-char modKey = (char) KEY_LEFT_CTRL;
+char modKey = (char) MODIFIERKEY_CTRL;
 
-char buttons[7][6] = {
-  {'1'},
-  {'2'},
-  {'3'},
-  {'4'},
-  {'5'},
-  {'6'},
-  {'7'}
-};
-char sequence_length[] = {1, 1, 1, 1, 1, 1, 1};
+int buttons[7] = {KEY_1, KEY_2, KEY_3, KEY_4, KEY_5, KEY_6, KEY_7};
 
 
 void setup() {
@@ -23,7 +12,6 @@ void setup() {
   for (int i = 0; i < n_buttons; ++i) {
     pinMode(button_pins[i], INPUT_PULLUP);
   }
-  Keyboard.begin();
 }
 
 
@@ -41,23 +29,15 @@ void loop() {
 
 
 void set_button_state(int button_i, char state) {
-  char *sequence = buttons[button_i];
-  char len = sequence_length[button_i];
+  char key = buttons[button_i];
 
-  if (sequence_length[button_i] == 1) {
-    if (state == LOW) {
-      Keyboard.press(modKey);
-      Keyboard.press(sequence[0]);
-    } else {
-      Keyboard.releaseAll();
-    }
-  } else if(state == LOW) {
-    Keyboard.press(modKey);
-    for (int i = 0; i < len; ++i) {
-      Keyboard.press(sequence[i]);
-      Keyboard.release(sequence[i]);
-      delay(12);
-    }
-    Keyboard.releaseAll();
+  if (state == LOW) {
+    Keyboard.set_modifier(MODIFIERKEY_ALT);
+    Keyboard.set_key1(key);
+    Keyboard.send_now();
+  } else {
+    Keyboard.set_modifier(0);
+    Keyboard.set_key1(0);
+    Keyboard.send_now();
   }
 }
diff --git a/sketch.yaml b/sketch.yaml
new file mode 100644
index 0000000..298b5d5
--- /dev/null
+++ b/sketch.yaml
@@ -0,0 +1 @@
+default_fqbn: teensy:avr:teensyLC:usb=keyboard,opt=o1lto