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docs/lessons/classic-beatbox/challenges.md

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+# beatbox challenges
+
+Create sounds with variables.
+
+## Before we get started
+
+Complete the [beatbox](/microbit/lessons/beatbox/activity) activity and your code will look like this:
+
+
+```blocks
+let sound = music.noteFrequency(Note.A);
+input.onPinPressed(TouchPin.P1, () => {
+    for (let i = 0; i < 4; i++) {
+        sound = sound + 25
+         music.playTone(music.noteFrequency(sound), music.beat(BeatFraction.Sixteenth));
+    }
+})
+```
+
+**Challenge 1**
+
+Let's include a second sound `on pin pressed` *P2*. To do this, you need to add the same blocks as the banana keyboard activity. However, you must change alter `on pin pressed` from P1 to P2. Additionally, you must *decrease* the frequency of the variable "sound" by 25. Modify your code so that your code looks like this
+
+
+```blocks
+let sound = music.noteFrequency(Note.A);
+input.onPinPressed(TouchPin.P1, () => {
+    for (let i = 0; i < 5; i++) {
+        sound = sound + 25
+        music.playTone(music.noteFrequency(sound), music.beat(BeatFraction.Sixteenth));
+    }
+
+})
+input.onPinPressed(TouchPin.P2, () => {
+    for (let i = 0; i < 5; i++) {
+        sound = sound - 25
+        music.playTone(music.noteFrequency(sound), music.beat(BeatFraction.Sixteenth));
+    }
+
+})
+```
+
+* click *run* to see if the code works as expected.
+
+**Challenge 2**
+
+Finally, we want images to be displayed with sounds `on pin pressed`. Add `show LEDs` blocks under `on pin pressed` P1 and P2.
+