Tested, working and with some fresh new electrolytic capacitors to replace the exploding tantalums, this MXR pitch transposer and display are the perfect choice. Comes with footswitch

The MXR MX-129 Pitch Transposer is a rare, vintage rackmount effects unit released in the late 1970s that shifts audio pitch and adds metallic delays.

Key Features and Design

• Touch-Sensitive Controls: Four front-panel preset controls activate and change presets instantly upon skin contact.
• Regeneration and Mix: Features dedicated dry/wet mix and feedback/regeneration knobs to create swirling, atmospheric pitch loops.
• Unique Lo-Fi Character: Early digital-analog hybrid processing gives it a distinct, glitchy, and organic sound rather than clean transparency.

Notable Users

• Stuart Adamson (Big Country): Famous for using the unit to craft signature octave-up chiming guitar lines.
• Trevor Rabin (Yes): Used the processor to shape distinct, soaring lead guitar tones.
• The Edge (U2): Incorporated into early experimental delay and harmonic textures.