JMP Pro

Name: JMP Pro
Price: 137 USD
Author: Nembrini Audio

by Nembrini Audio · Amp Sim · Programmable preamp and amp sim with effects

Not rated yet

A guitar amp plugin from Nembrini Audio modeled on the Marshall JMP-1 preamp, with four channels and an EL34 power amp.

It adds delay, chorus or tremolo, reverb, a compressor, six cabinets and an IR loader, and is on sale for $29.99 (regular $137).

Best for: Guitars. Genres: Rock & Indie, Metal.

Keywords: electric guitar, clean, impulse-response based, aggressive, tube, crunchy, 90s, hardware emulation, modern, tight, bass, lo-fi.

What it does

JMP Pro (JMP Pro Valve Guitar Amplifier) models the Marshall JMP-1 rack preamp, which the developer describes as "four voiced channels of pure tone". It adds a virtual power amp, cabinets and studio effects for use in a modern mix.

Preamp: four voiced channels, Clean 1, Clean 2, OD1 and OD2, covering clean, crunch and high-gain British tones.
Power amp: class AB push-pull with four virtual EL34 tubes, with presence and volume controls and a power switch.
Effects: a digital delay with lo-fi filter and left/right offset, a switchable chorus or tremolo, and a hall reverb.
Dynamics: an analog-style noise gate tuned for guitar and bass, and a studio compressor.
Filters: low and high cut filters that can sit before or after the amp.
Cabinets and mics: six cabinets and four microphone models, with on/off-axis switching, continuous distance and position controls, and a mixer with solo, mute, pan and fader.
IR loader: load and blend three third-party IRs with volume, pan, phase, solo and mute, plus a file browser.

The current version is 1.0.8. It was on sale when checked.

Source: Nembrini Audio product page

When to use it

JMP Pro is the better pick when you want the tight, mid-heavy sound of the JMP-1 rack era in one cheap, focused plugin. Compared with AmpliTube 5 MAX and Guitar Rig 7 Pro, it has only one preamp, but it models that unit's four channels in detail and still includes delay, modulation, reverb and an IR loader. Next to Neural DSP's Archetype: Nolly X or Gojira X it is far cheaper, though one Gear Forum user placed Nembrini's amps a tier below Neural DSP and Line 6. If you mainly need a modern high-gain metal suite, those are the stronger choice; for 1990s rack tones, JMP Pro is more specific.

Best for: 1990s British rock and metal rhythm tones, from clean channels to tight high gain.
Genres: rock, hard rock, thrash and groove metal.
Look elsewhere if: you want many amps (AmpliTube 5 MAX, Guitar Rig 7 Pro) or vintage plexi tones (MRH159 Brown Sound).
Tip: the KVR reviewer uses it three ways: as a preamp alone, as a full rack, or feeding a separate power amp.

What producers say

The few user reports are positive, with JMP Pro named as one of Nembrini's stronger models.

KVR users rate it 5 out of 5 from 1 review (2022), calling it "the by far best" JMP-1 simulation, with good clean, crunch and high-gain tones and better value than the hardware.
The Gear Forum thread (2025) had users calling Nembrini plugins "killers" and the JMP and MP-1 models especially good.
Criticisms: the same thread rated Nembrini "a tier below Line 6, NDSP, Mercuriall, UAD" and noted uneven quality across the range.

Where to buy

Nembrini Audio: $137

Tutorials and reviews

Similar plugins

MP1 Pro by Nembrini Audio · Programmable preamp and amp sim with effects · $137
Cali Axis by Nembrini Audio · Programmable preamp and amp sim with effects · $137
Marshall JMP 2203 by Universal Audio · British amp sim · $99
Marshall JMP 2203 by Softube · Marshall amp sim · $99
MRH810 V2 by Nembrini Audio · British lead amp sim · $137
Marshall Silver Jubilee 2555 by Softube · Marshall amp sim · $99
Solidus VS8100 by Audiority · Marshall Valvestate 8100 amp sim · $65
Lion '68 Super Lead Amp by Universal Audio · British lead amp sim · $99
Marshall Plexi Super Lead 1959 by Softube · Marshall Plexi amp sim · $99
Friedman Amplifiers Collection by Universal Audio · Guitar amp sims · $150

All amp sims