This is a demonstration of a low-frequency oscillator (LFO) modulating the pitch of a sound. The sound in this case is a 440 Hz sine wave (set the amount to 0 to listen to the unmodulated sound). This project is an extension of an earlier project that demonstrates how to make square or sawtooth waves with multiple sine waves: https://scratch.mit.edu/projects/412022191/ For information on how that works, check that project instead. Sound settings: ► Harmonics - the number of harmonics to combine. ► Multiple increment - the amount to increment the multiple with for each harmonic. This must be an integer to produce a harmonic, but like in @HTML-Fan's version, I let you set fractions here just because it looks cool and gives you an understanding *why* it has to be multiples. ► Frequency (Hz) - the number of times per second the sine wave moves from its highest point to its lowest and back. This is measured i hertz (Hz). ► Amount (st) - The modulation amount, in semitones (st) - the difference in pitch between one key and the next on a piano. Visual settings: ► X scale - The horizontal scale at which to draw the wave. 1 is equal to 100%. ► Y scale - The vertical scale at which to draw the wave. 1 is equal to 100%. ► Segments - the number of line segments to use when drawing the sine wave.
Thanks to @HTML-Fan, who ignited my current interest in sound waves, and who made the project my earlier project was largely based on: https://scratch.mit.edu/projects/411575284 The main inspiration and source of information for this specific project is this fantastic introduction to synthesizers: https://learningsynths.ableton.com/en/lfos/modulating-pitch-with-oscillators The 440 Hz sine wave was generated using Audacity.
