The Two Notes Opus is a pedalboard-format unit from Two notes that the maker describes as an "Amp Sim & DynIR Engine": a preamp, power amp model and cabinet simulator in one box that sits at the end of a board and takes the place of an amp and cab. Two notes positions it as building on the C.A.B. lineage and the company's digital cabinet simulation legacy, promising "apex-level tone in a go-anywhere footprint"1. It lists at 269.99 USD as of the maker's product page dated 2026-10-202.
What it does and how it is controlled
The Opus adds what Two notes calls Pre- and Power-amp Tube-Stage Modeling (TSM) on top of its DynIR cabinet engine1. MusicRadar's reviewer came away convinced, writing that "All in all, it's hard to see the Opus as anything other than a slam dunk"4. The same review notes the unit is mono: "Some might take issue with it being mono, but that was true of Two Notes' rack kit and isn't likely to be a surprise" to players moving from that gear4.
The DynIR side carries over from the Torpedo range, which includes official captures by Celestion, ENGL, REVV and Victory Amplification among its DynIR cabinets6.
Inputs, outputs and running it into real gear
MusicRadar's Alex Lynham lists the connections as follows4:
- Inputs: Line In, Aux In, MIDI In
- Outputs: Speaker Out, Headphone Out, DI Out, Line Out
The Opus can be used in several ways depending on what sits downstream of it. MusicRadar's review describes the options: it can run at the end of a board as a combined modeling amp solution, used with headphones or as a cab sim and IR loader with the pre and power stages disabled, and the power amp modeling is disabled when it feeds an effects return or tube power amp4.
The Opus is mono. MusicRadar's reviewer notes that "some might take issue with it being mono, but that was true of Two Notes' rack kit and isn't likely to be a surprise" to players who know the company's earlier units4.
Power and MIDI
Power comes over USB-C, which Two notes calls a "future-proofed specification", alongside the MIDI integration2. The maker's product page states the unit "can be shipped with a UK or EU power supply", chosen before adding to cart1. Players outside the UK and EU should note that the supply offered at checkout covers those two plug types only.
Where it comes from: the Torpedo CAB lineage
MusicRadar's review traces the Opus directly to the company's earlier hardware: "The Opus builds on the Torpedo CAB, its first foray into pedalboard format units"4. Two notes is known for the Torpedo series of load box, cab sim and power attenuator products, including the Captor X, Captor, C.A.B. M and Reload7. The current Torpedo C.A.B. M+ carries the same family traits, with Volume, Contour and Depth power amp controls, Pentode and Triode tube modes, and a headphones output6.
What reviewers said
MusicRadar's Alex Lynham was strongly positive: "All in all, it's hard to see the Opus as anything other than a slam dunk. It's good enough that even if you have an existing Two Notes rack unit, it's tempting"4. Guitar.com's review focused on the expanded modeling, noting the five preamp models now sitting alongside the virtual cab and mic library8, and GuitarPlayer's Dave Hunter highlighted the 99-preset access from the single encoder5.
Videos
Pete Thorn
Andertons Music Co
Sweetwater
Questions
What is the Two Notes Opus?
The Opus is a pedalboard-format unit from Two notes that the maker describes as an Amp Sim and DynIR Engine. It models preamp and power amp tube stages, carries a library of virtual cabinets and mics, and adds MIDI integration. It builds on the company's Torpedo C.A.B. lineage of digital cabinet simulation, and MusicRadar's reviewer described it as a combined modeling amp solution that can run at the end of a board.
Can the Two Notes Opus run into a guitar cab or tube power amp?
Yes, with limits. MusicRadar's Alex Lynham notes it can be run at the end of a board as a combined modelling amp solution, used with headphones or as a cab sim and IR loader with the pre and power stages disabled. When it is feeding an effects return or a tube power amp, the power amp modelling is switched off so it does not stack with the real power stage.
Is the Two Notes Opus mono or stereo?
The Opus is mono. MusicRadar's reviewer pointed out that some players might take issue with this, but noted it was also true of Two notes' rack units, so it is not likely to be a surprise to anyone familiar with the company's gear.
What power connector does the Two Notes Opus use?
The Opus uses a USB-C power connector, which Two notes describes as a future-proofed specification. The maker's product page says the unit can be shipped with a UK or EU power supply, chosen before adding to cart, so buyers in other regions need to arrange a suitable supply.
How many preamp models does the Opus include?
Five. Guitar.com's review, published in December 2023, counted a total of five preamp models alongside the library of virtual cabs and mics. The maker adds that the Opus includes Pre- and Power-amp Tube-Stage Modeling, which it calls TSM.
Sources (8)
- OPUS - Two notes, Two notes
- OPUS - Two notes, Two notes
- Torpedo C.A.B. M+, Two notes, 2025-08-01
- Two Notes Opus review, MusicRadar, 2024-01-04
- “The Opus might not displace your Helix, Fractal, Kemper or Quad Cortex, but it offers a lot of good-sounding emulation in a compact and usable package at a fraction of the price”: Two Notes Opus Amp Sim and IR Loader Unit review, GuitarPlayer (www.guitarplayer.com), 2024-04-10
- Torpedo C.A.B. M+, Two notes, 2025-08-01
- Differences between Captor X, Captor & C.A.B. M.?, Two notes, 2020-11-06
- Two Notes Opus review: the missing piece of your direct rig?, Guitar.com, 2023-12-26
