Walrus Audio announces Monumental Harmonic Stereo Tremolo pedal
April 1, 2024 · 5 sources

Walrus Audio announced the Monumental Harmonic Stereo Tremolo, an analog optical tremolo that adds stereo operation and new controls to the Monument line12. Gearnews reported the announcement in April 2024 and described the pedal as a take on the Monument Harmonic Tremolo V2 from 20192.
The Monumental Stereo Tremolo has true stereo input and output on unbalanced 1/4-inch TS jacks, and Walrus says it can also run in mono13. A Pan control sets the stereo spread: fully counterclockwise the left and right channels share the same LFO, and turning it clockwise offsets the right channel's LFO up to 180 degrees out of phase1. An S-B-H control blends between standard and harmonic tremolo modes1. Walrus describes harmonic mode as a low-pass and high-pass version of the signal modulated 180 degrees out of phase, in the manner of Fender Brownface amps1.
The pedal has three onboard presets plus a live mode; pressing both footswitches cycles through them, with the LED showing red, green, blue or white for live1. Every parameter can be assigned to expression control, and the tap tempo footswitch also provides a momentary ramp up or down, with the ramp location set by the rate control1. Gearnews lists six wave shapes (sine, square, saw, ramp, bump and random) and five tap divisions (quarter, quarter triplet, eighth, eighth triplet and sixteenth)2. MusicRadar reports a Volume control that can provide up to +10dB of clean gain3.
"The ability to ramp up OR down (ramp location controlled via rate control) to achieve \"Leslie\" style ramp from your current rate"
Specifications from Walrus Audio1:
| Spec | Value |
|---|---|
| Bypass | True bypass |
| Headroom | 1.7Vpp (2.6Vpp with 12V supply) |
| Input impedance | ~1M |
| Output impedance | ~300Ohm |
| Noise level | -102.5dBu |
| THD | 0.072% -20dBu @ 1kHz |
| Frequency response | 40Hz-20kHz |
| Power | 9VDC-12VDC, 100mA, center negative |
| Enclosure | 2.25" x 2.93" x 4.8" including jacks |
MusicRadar reported the pedal available now in orange or black enclosures at $2793. Guitar Pedal X listed it at $279.99 from the Walrus Audio webstore4. Art is by David Hüttner15.
Sources (5)
- Monumental Harmonic Stereo Tremolo - BLEMISHED, walrusaudio.com
- Walrus Audio Monumental Harmonic Stereo Tremolo, gearnews.com
- Walrus Audio's feature-packed Monumental lets guitarists blend standard and harmonic tremolo in stereo for sonic adventures in “rich, luscious, warm pulsating modulation” | MusicRadar, musicradar.com
- Guitar Pedal X - GPX Blog - Walrus Audio massively upgrades its now Monumental Harmonic Tremolo - including Presets and Full Stereo Capabilities, guitarpedalx.com
- Walrus Audio Monumental Stereo Tremolo | Delicious Audio, delicious-audio.com