Scratch Card - Recorder

Novice
Scratch
PDF

Activity Checklist

  • Create two new lists (for all sprites). Call one of them instrument and the other timing.
  • Create a new variable (for all sprites) called recording
  • For each of your instruments (drum, piano, each sound sample etc.), you will need to add the following items to the when I receive block.

    if
    recording
    =
    1
    then
    add
    timer
    to
    add
    cat
    to
  • Change the word “cat” in add [cat] to [instrument v] to match the name of the message used to play this sound.

    when I receive
    play drum
    48
    for
    0.2
    beats
    if
    recording
    =
    1
    then
    add
    timer
    to
    add
    cat
    to
    set size to
    110
    %
    wait
    0.1
    secs
    set size to
    100
    %
  • Draw a new sprite and give it a red circle costume. Name this sprite “Record”. record costume
  • Create a script that sets recording to 1 and deletes all of instrument and timing when clicked.

Test your project

Try clicking the record button. What happens when you play instruments?

  • Create another sprite and give it a costume in the shape of a green arrow. Call this “Play”. play costume
  • Create a new variable called index for Play only.
  • Now we need to make the playback actually do something. Add this script to “Play”

    when Play clicked
    set to
    0
    set to
    1
    reset timer
    forever
    if
    item
    index
    of
    <
    timer
    then
    broadcast
    item
    index
    of
    change by
    1
    if
    index
    >
    length of
    then
    stop script

Test your project

Press the green play button. what happens?

Now click the red record button and play some instruments. When you’re done, press the green play button again. What happens?

Play some more instruments without pressing record. Then play the green play button again. What happens?