Amp ONE

Inter-app-audio application for real-time preamp simulation for iPad

For the release of Amp ONE I was working alone for an entire year, shortly after the release plugin JCM800 and Harlequin. I wanted to create something greater, better, more modern, freeing guitarist from a large and noisy computer and giving the opportunity to be more portable, while raising the bar for quality of modeling guitar amplification to a new level.

Amp ONE uses the same principle that is used in electrical circuits simulation programs like LTSpice IV. The difference lies in the use of pre-trained models of artificial neural networks to replace an algorithm of solving systems of nonlinear differential equations. This enables hundreds of times to increase the simulation speed of electrical circuits, compared to LTSpice IV.

Preamp section

Modeled preamp circuits:

Simulated circuit	Channel	Destription
Marshall® JCM800	Single channel	Metal sound of 80s
Marshall® JCM800 tweaked	Single channel	More gain than original JCM800
Cornford® Harlequin	Single channel	Sound of Cornford Amps
Engl® E530	Clean Lo Clean Hi Lead Lo Lead Hi	Legendary E530 preamp. Huge opportunities to obtain the desired sound.
Krank® Krankenstein	Clean Lead	Good hi-gain and pristine clean sounds.
Krank® Revolution	Lead	Almost same schematics as in Krankenstein. Changed a few resistors.
American hi-gain amp	Clean Vintage Orange Vintage Red Modern	Fine hi-gain and amazing clean sounds.
EVH® 5150 III	Clean Rhythm Lead	Most complex schematics for simulation. Big CPU consumption. For sound of all styles.
Fender® Blues Junior III	Clean Fat	Amazing clean sound.

Fast overview:

Poweramp & Cabinet sections

The main character of the amplifier is formed by the preamplifier. But there is still a guitar amplifier power stage. In Amp ONE power amplifier stage is modeled as part of the classical guitar cabinet through convolution.

To capture impulse responses we used poweramp of Dual Rectifier which was attenuated by Marshall Power Breaker 100 connected to speaker section of Marshall AVT50. Acoustic response was recorded through Shure SM57 mic.

FX sections

Noise Gate / Swell

Parameters	Description
Thresholds: Closing/Opening	The Opening value sets the signal level above which kicks off the opening of the noise gate. The Closing value sets the level of the signal when lowering which will start closing the noise gate.
Peak Detection: Attack/Release	High Attack reduce sensitivity to the fast amplitude changes. Low Release reduce smoothness of detected amplitude envelope.
Timings: Fade-in/out	Used to set duration of the opening and closing of the noise gate. Swell effect achieved if Fade-in value will be greater than Fade-out value.

Chorus

Reference model	Parameters	Description
Roland® JUNO-60 synth	Mix, Oscillation Mode, Speed, Stereo	This chorus effect produces rich and expansive sounds. Good for clean and warm sound
Roland® Dimension D	Mix, Speed, Depth, Crossover Mix, Crossover High Freq	This chorus is famous for delivering a subtle, stereoizing enhancing, airy effect while adding more presence to a sound
Korg® Triton synth chorus	Mix, Speed, Depth	Three tap stereo chorus. Makes the amazing effect of widening of stereobase. Good for clean sound
VOX® Stereo Chorus	Mix, Speed, Depth	Simple but good sounding stereo chorus. Good for Hi-gain sound enhancing

Delay & Reverb

Additional features

Snapshot and preset systems are used to save and restore your settings. Snapshot system for saving/restore all settings at once. Preset system for save/restore settings of selected section (preamp/cabinet/chorus/delay/reverb).

System Requirements

Apple iPad 2 or later

iOS 7.1 or later

External audio interface to connect guitar to iPad

Amp ONE Screenshots

View in AppStore