The Model 129’s compact size, rugged construction, and simple controls made it a popular choice among musicians and audio professionals alike. The MXR Model 129’s pitch transposition was achieved using a voltage-controlled oscillator, which could be adjusted using a control knob on the front panel of the unit.
The MXR Model 129 Pitch Transposer was particularly well-suited for use in the studio, where it was used to create harmonies and other effects. It was also popular among guitarists, who used it to create a range of different sounds, from subtle pitch bends to extreme transpositions.
Despite being produced in the late 1970s, the Model 129 remains a popular piece of equipment among musicians and audio enthusiasts today, and its simple yet effective design has made it a classic piece of audio equipment.
The MXR Model 129 Pitch Transposer was available with an optional display that allowed users to see the amount of pitch shift in cents, providing greater precision and control. These units are now considered rare and highly sought after by collectors, making them difficult to find on the second-hand market.
They were part of MXR’s professional rackmount series in the late 1970s and early 1980s, designed to offer high-quality pitch modulation effects for both studio and live use. Due to their scarcity and unique functionality, they can command high prices when they do appear for sale.
The specifications shown are an estimate based on similar model.
