Tech 21 Geddy Lee Amalgamation Signature Chorus

The Tech 21 Geddy Lee Amalgamation Signature Chorus is a chorus pedal made by Tech 21 and tailored specifically for bass. It was announced on 20 January 2026 and developed with Geddy Lee, the Rush bassist, and his longtime tech, Skully¹². What sets it apart from a standard chorus is a Detune control that shifts the pitch of the choral voicing, plus a Deviate mode that adds an extra voice for a thicker, more pronounced effect¹.

Geddy Lee describes the aim in his own words on the Tech 21 product page:

A bass-friendly chorus with a Detune control

Chorus pedals built for guitar can thin out a bass signal, so the Amalgamation was engineered from the ground up for the low end. Tech 21 says the Detune control lets you adjust the pitch of the choral voicing, "adding sonic girth to create thick, lush, bass-compatible chorus"¹. Gearnews called the result a capture of that "swirlicious" tone, with studio-quality modulation that preserves low-end integrity, in a roadworthy stompbox specifically engineered for bass⁴.

The pedal is housed in a compact enclosure, and Bass Musician Magazine noted that it offers "an unusual amount of flexibility to achieve a variety of chorus voicings" for its size². Alongside the signature Detune control, it carries standard Speed and Depth controls that Gearnews says let you dial in everything from a gentle thickening to an outrageous swirl, plus a dedicated Level control⁴.

The controls and Deviate mode

Four controls, LEVEL, DETUNE, DEPTH, and SPEED, along with a Deviate mode, handle the effect's adjustments¹.

The Detune knob is the unusual one. Gearnews describes it as subtly shifting pitch to create an enveloping shimmer⁴. Because it works independently of the modulation, a player can set Speed and Depth to their minimum and still get a chorus-style thickened tone from Detune alone, or push it further for pitch-shifted doubling¹.

Deviate mode is the second signature feature. Engaging it alters the functionality of the Detune control and adds an additional voicing for even more depth. Tech 21 describes the result as sounding "as if 3 people are playing at the same time," and positions it as particularly useful for solos, where a more pronounced effect helps a bass line cut through¹. Gearnews sums it up as adding a secondary voice for greater depth and complexity⁴.

Bass Magazine characterized the Speed and Depth pair as taking the modulation "from sober to slightly tipsy to downright 'wobbly'"³.

Power and size

The Amalgamation runs on a 9V alkaline battery, which is not included, or on an optional DC power supply, Tech 21 model #DC9, sold separately¹. Bass Magazine confirms both options: battery not included, DC supply optional³.

The enclosure measures 3.75″ x 4.75″ x 2″, compact enough to sit alongside other pedals without eating much board space¹. The pedal is designed and manufactured by Tech 21 USA, Inc.³.

Designed with Geddy Lee and his tech

Tech 21 worked directly with Geddy Lee and his tech, Skully, to develop the pedal¹. It continues a partnership that began after Rush's R40 tour, when Geddy Lee wanted to streamline his gear for new projects and worked with Tech 21 on the GED-2112 signature rackmount SansAmp, first announced in 2017⁵⁶⁷. That design was later adapted into pedal form as the Geddy Lee YYZ Shape-shifter Signature SansAmp and the Geddy Lee DI-2112 Signature SansAmp, making the Amalgamation Chorus the chorus entry in the signature line.

As with the rest of the signature range, the controls are designed to give the player flexibility to obtain their desired sounds rather than to lock in one preset tone¹.

Videos

Click to load

Click to load

Click to load

News

Questions