The HAARP is a digital polyphonic pitch arpeggiator based on the EQD Arpanoid. It features a 24LC32A EEPROM with the HAARP algorithm preloaded. The 2019 edition of the HAARP includes some new features. Instead of a standard potentiometer, it now has an 8-position rotary switch for program selection. This switch provides better tactile feedback and more reliable alignment of graphics with the switch positions. Additionally, the new design eliminates the need for the ATTINY microcontroller.

The HAARP has several controls that allow for customization of the arpeggiation effect. The Rate control adjusts the speed of the arpeggiation, while the Step control sets the number of steps in the arpeggiation pattern. The Mode control determines the specific arpeggation pattern used. The Wet control adjusts the level of the wet signal, while the Dry control adjusts the level of the dry signal. Finally, there is a Direction toggle switch that allows for selection of the arpeggation direction, with options for Up, Alternating, and Down.

Summary created by AI from the original source.