Add answer key for JavaScript Blocks EarSketch workshop

content/english/javascript-blocks-earsketch/answer-key.md

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+---
+title: "Blocks: EarSketch - Answer Key"
+date: 2026-04-27T00:00:00-07:00
+draft: false
+weight: 15
+hidden: true
+---
+
+{{% notice note %}}
+This is a teacher's reference for the JavaScript Blocks EarSketch workshop. The workshop uses drag-and-drop blocks, but each block generates JavaScript code underneath. This answer key shows the equivalent JavaScript code for each activity so teachers can verify student work. Since this is a creative music workshop, there are many valid answers. Your code is correct if it runs without errors and produces music!
+{{% /notice %}}
+
+## Activity 1: Set Tempo and Add Sounds
+
+Drag a `fitMedia()` block below the `setTempo` block and fill in the parameters:
+
+**Equivalent JavaScript:**
+```javascript
+setTempo(120);
+fitMedia(YG_TRAP_ELECTRIC_PIANO_FILTERED_1, 1, 1, 9);
+```
+
+**Block parameters:**
+
+| Parameter | Value | How to set it |
+|-----------|-------|--------------|
+| Sound | `YG_TRAP_ELECTRIC_PIANO_FILTERED_1` | Click "sound" in the block, then paste from the Sounds pane |
+| Track | `1` | Use the dropdown |
+| Start | `1` | Start measure |
+| End | `9` | End measure |
+
+## Activity 2: Make a Song (Multiple Sounds)
+
+Add four `fitMedia()` blocks, each on a different track:
+
+**Equivalent JavaScript:**
+```javascript
+setTempo(120);
+fitMedia(RD_TRAP_BELLLEAD_1, 1, 1, 9);
+fitMedia(YG_TRAP_STRINGS_2, 2, 1, 17);
+fitMedia(YG_TRAP_ELECTRIC_PIANO_FILTERED_1, 3, 1, 17);
+fitMedia(YG_TRAP_BASS_9, 4, 1, 9);
+```
+
+{{% notice tip %}}
+**Key concept for students:** Each `fitMedia()` block should use a different track number. This keeps sounds organized and lets multiple sounds play at the same time.
+{{% /notice %}}
+
+## Activity 3: Add Effects
+
+Drag a `setEffect()` block (the 4-parameter version) below the `fitMedia()` blocks:
+
+**Equivalent JavaScript:**
+```javascript
+setTempo(120);
+fitMedia(RD_TRAP_BELLLEAD_1, 1, 1, 9);
+fitMedia(YG_TRAP_STRINGS_2, 2, 1, 17);
+fitMedia(YG_TRAP_ELECTRIC_PIANO_FILTERED_1, 3, 1, 17);
+fitMedia(YG_TRAP_BASS_9, 4, 1, 9);
+setEffect(2, DELAY, DELAY_FEEDBACK, -6.0);
+```
+
+**setEffect parameters (4-parameter version):**
+
+| Parameter | Value | Meaning |
+|-----------|-------|---------|
+| Track | `2` | Which track (use `0` for master/all tracks) |
+| Effect type | `DELAY` | Select from dropdown |
+| Parameter | `DELAY_FEEDBACK` | Select from dropdown |
+| Value | `-6.0` | Range: -120.0 to -1.0 |
+
+## Activity 4: Fade In with Effects
+
+Drag the 7-parameter `setEffect()` block to create a volume fade-in:
+
+**Equivalent JavaScript:**
+```javascript
+setTempo(120);
+fitMedia(RD_TRAP_BELLLEAD_1, 1, 1, 9);
+fitMedia(YG_TRAP_STRINGS_2, 2, 1, 17);
+fitMedia(YG_TRAP_ELECTRIC_PIANO_FILTERED_1, 3, 1, 17);
+fitMedia(YG_TRAP_BASS_9, 4, 1, 9);
+setEffect(2, DELAY, DELAY_FEEDBACK, -6.0);
+setEffect(0, VOLUME, GAIN, -60, 1, 0, 3);
+```
+
+**setEffect parameters (7-parameter version):**
+
+| Parameter | Value | Meaning |
+|-----------|-------|---------|
+| Track | `0` | Master track (all sounds) |
+| Effect type | `VOLUME` | Volume control |
+| Parameter | `GAIN` | Loudness setting |
+| Start value | `-60` | Nearly silent (in decibels) |
+| Start measure | `1` | When the fade begins |
+| End value | `0` | Normal volume |
+| End measure | `3` | When the fade ends |
+
+{{% notice tip %}}
+**How the fade-in works:** Volume starts at -60 dB (nearly silent) at measure 1 and increases to 0 dB (normal volume) by measure 3. The more negative the decibel number, the quieter the sound. Do not exceed 0 dB.
+{{% /notice %}}
+
+## EarSketch Quick Reference
+
+| Block | Purpose | Key Parameters |
+|-------|---------|---------------|
+| `setTempo(bpm)` | Set song speed | 45-220 BPM |
+| `fitMedia(clip, track, start, end)` | Add a sound | Choose clip from Sounds pane |
+| `setEffect(track, type, param, value)` | Add an effect | Choose type/param from dropdowns |
+| `setEffect(track, type, param, startVal, start, endVal, end)` | Automate an effect | For fade-in/fade-out |