Check the listing for details. Boss RDD-20 Digital Delay Effect Unit Micro Rack Series Half Rack Mount. Condition: Used, Made in Japan. Listed at 123.99 USD. The Boss RDD-20 Digital Delay Effect Unit is a high-quality effects pedal designed for musicians who play instruments like electric guitar, bass guitar, acoustic electric guitar, and lap & pedal steel guitar. Made by Boss in Japan, this digital delay unit offers advanced processing capabilities for creating intricate delay effects. With its half rack mount design, it can easily be incorporated into a pedalboard setup to enhance the overall sound of the performance. Ideal for creating dynamic and engaging musical experiences, the Boss RDD-20 Digital Delay is a versatile and reliable option for guitarists and bassists looking to expand their creative capabilities. Used it a handful of times and I'm trying to downsize my pedal collection.