How can I prepare an audio presentation on sratch
Answers
Sounds
Sounds are the items that are available only by importing or recording. These can be obtained in the "Sounds" tab, in which one can import, record, play, and edit sounds.
The following blocks control the playing of these sounds:
play
sound
— Begins the sound and executes the rest of its script, without waiting for the sound to finish playing.
play
sound
until
done
— Plays a sound, waits for it to finish playing, and will carry on with its script.
stop
all
sounds
— Cancels all sounds currently playing.
set
volume
to
%
— Sets a sprite's volume.
change
volume
by
— Changes a sprite's volume by a given amount.
Notes
Main article: Notes
play
drum
for
beats
play
note
for
beats
set
instrument
to
Notes can be controlled with a variety of blocks.
Prior to Scratch 2.0, notes were accessed by a MIDI system, which are varieties of notes built in to one's computer. However, since Scratch 2.0 ran on Adobe Flash, the MIDI sound library is uncapable of use,[citation needed] and therefore the Scratch Team had to create their own sounds library built in to the Scratch program. The following blocks are related to notes:
play
drum
for
beats
— Plays the specified drum for a given amount of beats.
play
note
for
beats
— Plays a given note from an instrument chosen in other blocks.
set
instrument
to
— Sets the current instrument to one selected from a drop-down menu.
set
tempo
to
— Sets a sprite's tempo (affects the "beat" speed).
change
tempo
by
— Changes a sprite's tempo a given amount.
rest
for
beats
— Plays a rest for a given amount of beats.
Accessibility of Sounds
Importing
To obtain these, one has to view the Sounds tab of a sprite/stage and select the Import button (which appears as a folder). The user will be able to import sounds from their desktop or varying locations, including a sound library that comes with Scratch.
Note Note: When a surround sound audio file is converted to mono, the surround channels are removed. This is due to Scratch's limitations with sound.
Recording
The Scratch 3.0 sound editor.
Main article: Sound Editor
Sounds can be recorded, imported, edited, exported and modified in the Scratch 3.0 sound editor. It provides simple options to edit an existing sound for many benefits. For more advanced options not within Scratch's, an external sound editor can be used, but it is not recommended to record music from other websites because this will result in low-quality music with tons of background noise and quietness. The best way to do it is to import music.
Note Note: When recording sound, it may be helpful to turn the volume up a little bit in the Sound Editor before recording. Turning up the volume will make it easier for Scratchers to hear the sound recorded when a project is launched.
Uploading MP3 Bug
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Blank MP3 Bug
With an update to Scratch 2.0, there was also a glitch that imported MP3 files would be blank. However, this glitch did not affect WAV files so some scratchers resorted to audio converters or editors such as Audacity to convert their files.
Renaming Bug
After a fix was put upon this, another glitch occurred in which imported MP3 files were renamed was fixed on January 20, 2015.[2]
Sounds and Actions
There is a slight delay the first time the Scratch player plays a sound. This delay will not be evident while working on the project, only when the page is reloaded entirely. The effect of this is that if one message triggers two scripts, one playing a sound and one animation, the animation script will start running before the sound starts. A very short pause using a Wait Block before the animating script will prevent this.