Positive Grid Bias Head

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Now guitarists can turn their iPhone into a world-class guitar amps and effects processor. Users can purchase three different licenses to add even more analog-sounding amps, guitar pedals and high def stereo rack effects. It also provides access to 44 more factory presets, so players can get to get rocking right away. With these diverse packs, players can have thousands of dollars worth of gear at the touch of a fingertip.
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Positive Grid Announces Free BIAS FX LE Guitar Effects Processor From December 7-9, 2018

Published March By Bob Thomas Insanely tweakable, and promising the ability to mimic your own amp, could this be the last word in amp modelling? And the result might appeal equally to the incessant tweakers and those who just want to plug and play. Overview Other than the global output level, the front-panel controls are all programmable. The upper row is less familiar territory: Adjacent to these is a second pair of controls, the first of which switches in up to five cascading preamp tube stages.

The other modifies the overall level of distortion in the selected stages. Next comes a four-position switch that sets the power-amp topology. You can choose from: Footswitch 1 is compatible only with I2C protocols for Positive Grid products, and footswitch 2 accepts only latching footswitches. Despite the guitarist-friendly styling, a bright blue light by the Bluetooth logo rather gives the game away that this is no normal amp!

Two Utility toggle switches come next, one of which puts the footswitch inputs into calibration mode. The other switches between serial and parallel modes, turning its bi-colour LED and that of the cab Sim from red to blue as it does so. It also enables you to instantly save your changes to a preset.

And I could live with that The user interface is functionally identical on both desktop and iPad versions, the only difference being that the controls for the Noise Gate and Room Control sit in pop-up windows on the iPad. Each amp model comprises eight blocks: By clicking on a stage in the signal flow mapped out at the top, the lower part of the screen changes to give you much deeper control.

Clicking on a block brings up its controls, and each block contains multiple presets, allowing you to build new amp models very quickly. Alternatively, you could start from the cleanest preset Acoustic and build your own tube amp more or less from scratch.

The high- and low-frequency controls have a shelving response, the mid has a peaking response and all three can be individually bypassed. The Low Cut Frequency knob controls a high-pass filter that models changing the value of the cathode-bypass capacitor in a real amp.

The Tone Stack provides tone control choices based on nine classic guitar amps five American, three British and one German , one British and three American bass amps, and two further EQs, one specifically for use with acoustic guitars and the other, Studio, a three-band sweep type. After the Tone Stack comes the power amp, whose options take you through the history of guitar-amp output stages, from the early days of single-ended Class A, through both concertina and long-tailed pair phase splitters all of which are tube-based , to transistors.

The Bias Adjust, as in the preamp, lets you run the power-amp tubes anywhere between cold and hot, which changes the harmonic content of the output. The final knob in the power-amp section, Resonate, modifies the impedance curve of the virtual loudspeakers, resulting in changes in the upper and lower frequencies, the nature of which depend on the output tubes and the transformer type.

The next module governs the power supply and output transformer settings. In the power supply, you have the choice of solid-state or tube rectification, via either a 5Y3GT as found in early tube amps or the later favourite, the GZ There are three transformers on offer: American, emphasising the upper mids; British, with slightly fuller low-mids and more highs than the American; and Fat, which has a broader mid-range and a more extended bass and treble response than the other two.

The final module, Cab simulator, offers 23 electric guitar cabs, an acoustic cab, an acoustic simulator and four bass cabs. Bands 1 and 8 are shelves, with the six in between being parametric. The Bias Amp software also gives you control of a noise gate, with input, threshold and decay controls, and allows you to set the Custom knob to give you instant access to one of a wide range of module parameters stored on a per-preset basis.

And Bias Amp Professional also contains a cabinet IR Loader, enabling you to load third-party impulse responses into a preset and transfer the result to the Bias Head. This knob is the only programmable front-panel control that requires you to use Bias Amp. If you use a MIDI floorboard, you can also recall patch changes and use continuous controller messages to change any front-panel function except Topology and Power Amp.

I found making adjustments to distortion, frequency profile and levels in Bias Amp Professional very intuitive, despite the underlying complexity. The standard preamp there are three more with varying switch and control complements has switch and nine tube combinations, plus five switchable tube stages and 11 rotary pots. Then there are the 15 tone stacks.

The standard power amp there are three others has 64 switch combinations and six pots. Sound Choice? The amp-match facility is impressive. Like the Kemper profiling amp which takes a rather different approach to the same objective , there are small differences between the result and the real amp — though, importantly, the results do sound very good, and if you pick a model as close as possible to your own amp as the starting point, take a bit of care and do a bit of tweaking, it can give convincing results.

The Bias Head may lack onboard effects, but it works well with pedals and pedalboards, despite a couple of quirky restrictions on the effects-return routing.

With its W Class-D power amp driving a real speaker, the Bias Head came very close to recreating the feel of playing through a real tube amp and, most importantly, the playing experience was both enjoyable and inspiring. Incidentally, the Bias Head also comes in rackmount format, and both will soon be available worldwide with or without the Class-D power amp.

My bank manager is going to love me No Effects?

SOUND ON SOUND

Published March By Bob Thomas Insanely tweakable, and promising the ability to mimic your own amp, could this be the last word in amp modelling? And the result might appeal equally to the incessant tweakers and those who just want to plug and play. Overview Other than the global output level, the front-panel controls are all programmable. The upper row is less familiar territory: Adjacent to these is a second pair of controls, the first of which switches in up to five cascading preamp tube stages.

VIDEO: Positive Grid Releases Three New Expansion Packs For BIAS FX iPad

Out of Positive Grid, California comes a new standalone version of the well regarded BIAS FX guitar amp and effects processing plug-in. Guitar Effect Bundle (Download) Includes BIAS Amp 2 Professional, BIAS Fx Professional, BIAS Fx Expansion Packs (Metal, Bass, Acoustic), BIAS Pedal Delay. For the best result, you should use BIAS FX’s included effect pedals and racks, import BIAS amps into BIAS FX, but not to use BIAS Amp or.

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