The Millennium One Fifty from the Johnson Amplification division of Digitech, is the premier modeling amp that utilizes a hybrid configuration of an analogue (both valve and solid state) preamp with digital filtering (for amplifier 'modelling'), and a stereo digital effects stage, followed by a solid‑state stereo power amplifier. The whole package is housed in something resembling the traditional guitar combo format, with two 12‑inch Celestion Vintage 30 speakers, and is designed to integrate all the power and flexibility of a sophisticated rack system into the convenience of a portable 'single‑box solution'. Despite the inevitable complexity of the resulting system, every effort seems to have been made to keep the Millennium as conventional as possible for the guitarist used to more traditional rigs. Yes, of course there is an LCD screen and lots of pages to scroll through, should you so desire, but the Millennium does not require you to. You can, if you wish, use the thing more or less like a normal amp, driving everything from the front‑panel knobs.
The two speakers are fed by separate, solid‑state power amps (2 x 75W) allowing true stereo effects without the need for an external cabinet, whilst the preamp features two 12AX7 valves, as well as a solid‑state gain stage which can be used in parallel with the valve stage. The analogue signal is converted at 20‑bit (128 x oversampled) resolution for the effects stage, while a 24‑bit internal data path (48‑bit with the DSP co‑processor) ensures that the signal is not significantly degraded during processing. Up to four digital effects can be accessed simultaneously and all effects and amplifier parameters are available for real‑time MIDI control. Parameters may also be assigned to dynamic (signal level‑dependent) control, allowing some highly expressive, yet intuitive possibilities, such as chorusing on your clean sound which automatically disappears when you turn up your guitar volume to take a solo, or stereo echoes which do precisely the reverse, keeping your clean sound rhythmically uncluttered, but sliding themselves in behind your lead lines. These are very musically powerful effects which would go entirely unappreciated if they weren't easy to program. Fortunately, like the Millennium's external MIDI control assignments, they are every bit as easy to drive as the rest of the amp. A further attraction for some potential purchasers might be found in the fact that, as a software‑driven system, the Millennium is software updatable (both patches and the operating system) via the MIDI port — indeed, some of the points I raised with the company at the start of the review were fixed before the end of it with a new software version. Both impressive and comforting if you have invested faith and money in a system of this type.