Time-Varying Delay Effects

In the category of delay effects, variable delay lines are used for

• Doubling
• Phasing
• Flanging
• Chorus
• Leslie
• Reverb

(While reverberators need not be time varying, nowadays they typically are [104,58].)

In digital waveguide synthesis, variable delay lines are used for

• Vibrating strings (guitars, violins, ...)
• Woodwind bores
• Horns
• Tonal percussion (rods, membranes)

After an implementation note on time-varying delay lines, we will look at a number of time-varying delay effects requiring variable delay lines. The use of variable delay lines in digital waveguide models will be taken up Chapter 6.