diff --git a/tests.ts b/tests.ts
index 0592ba7..ca90472 100644
--- a/tests.ts
+++ b/tests.ts
@@ -6,9 +6,10 @@ bluetooth.onBluetoothDisconnected(() => {
 })
 bluetooth.startMidiService();
 basic.showString("S")
+let channel = 1;
 input.onButtonPressed(Button.A, () => {
     basic.clearScreen();
-    let piano = midi.inputChannel(0);
+    let piano = midi.inputChannel(channel);
     for (let note = 0x0; note < 0x5A; note++) {
         led.toggle(0, 0);
         piano.noteOn(note);
@@ -16,4 +17,15 @@ input.onButtonPressed(Button.A, () => {
         piano.noteOff(note);
         basic.pause(100);
     }
-})
\ No newline at end of file
+})
+input.onButtonPressed(Button.B, () => {
+    channel += 1;
+    basic.showNumber(channel);
+})
+input.onButtonPressed(Button.AB, () => {
+    basic.clearScreen();
+    for (let note = 0; note < 127; note++) {
+        led.toggle(1, 1);
+        midi.playDrum(note);
+    }
+})