SIVA is a Virtual Analogue multi-effects platform

Every overdrive, fuzz and amplifier effect is a full component by component simulation of the original circuit. Simulating every circuit node means the effects produce authentic tone and distortion characteristics, interact with each other realistically and respond how you would expect to volume and touch.

Cranked amps clean up on the volume knob just like the real thing. Fuzz into a dirty amp smooths out nicely.

SIVA is built in the UK and built to last

A powerful quad core 64-bit 1.2GHz audio processor, high fidelity analogue audio circuitry, built in wireless and an intuitive user interface in a robust steel case manufactured in the UK.

Eight high quality footswitches have bright LED indicators to visually connect them to the on screen label showing their function. Footswitches can be assigned to control individual effects, make multiple changes with one press (Tone Snaps), control tempo (Tap Tempo) or change to a different preset (Board Swap).

Find out more below and in the instruction manual here: SIVA Instruction Manual V1.0

Here's what Dave Barlow Guitar thought when he tried out SIVA:

Effects Listing

Overdrives & Fuzz

Horseman : Early 90's transparent overdrive

Valve Howler : Soft clipping op-amp overdrive from the late 70's

Obsession : Overdrive with asymmetric FET diode hard clipping

Rodent : Overdrive with symmetric hard clipping from '78

RedsBuster : Soft double diode clipping overdrive from early '90s

Big Cheese : Hard clipping overdrive with tone stack from late '80s

Shredder : High gain overdrive/distortion with tone stack from early '90s

Round Fuzz : Late 60's two transistor fuzz

Triangulator : Version 1 of the high gain NY smooth fuzz early '70s

Octave Fuzz : Circuit from the Tycobrahe pedal from the late '60s

Harmonicator : Circuit from the Interfax HP-1 of the early '70s


Fullerton '57 : Single input class A output stage produced from '57 to '60

Fullerton '55 : Two input class AB output stage (with cathodyne phase inverter - no feedback) produced from '55 to '60

Fullerton '61 : Two input long tail pair phase inverter and bias wiggle tremolo produced from '61 to '63

Fullerton '63 : Reverb model produced from '63 to '67

Bucks '68 : 50W British two input head with buffered tone stack produced from the late '60s

Bucks '76 : Stacked input stages for high gain master volume 50W

Kent '61 : 30W British amp with Top Boost modification

London '72 : 120W output stage with cathodyne phase inverter and filtered presence control


Vibe : Circuit from the Shin-ei vibe from '68

Chorus : Circuit from the large format Japanese chorus from '76

Flanger : Circuit from the deluxe version of the '78 NY flanger

Studio Comp : Circuit from the 1976 Peak Limiting amplifier

OTA Comp : Transconductance amp style compressor

Optical Comp : Compressor using light controlled resistors to control gain

Wah : Circuit from the Thomas Organ Company wah from '67


Ana Echo : Circuit from the classic Japanese analog echo from '81

Plate Reverb : Variable space plate reverb with adjustable wet/dry levels and bandwidth

Spring Reverb : Variable decay and level


EQ : A precision gain 10-band equaliser

Cab Sim : Detailed recreations of more than 50 speaker responses from both sides of the Atlantic

Cab IR : 1024 point impulse response. Use the USB cable to upload your own impulse responses to SIVA


Looper : Simple one button looper. Press once to start/loop/overdub. Double press to stop at end. Triple press to stop now.

Tuner : Polyphonic tuner

Noise Gate : Noise gate with variable threshold

Technical Specifications


All input and output analogue circuitry is class-A bipolar design for super low distortion (there are no op-amps in the signal chain).

Analogue to digital and digital to analogue convertors are 24 bit Burr Brown devices chosen for their linearity and operating at a crystal fixed 48kHz for lowest phase jitter.


Range: 3Vp-p

Dynamic range: 99dB

THD: 0.003%

Impedance: 910kΩ


Range: 4Vp-p

Dynamic range: 105dB

THD: 0.003%

Impedance (1/4" outputs): 115Ω

Impedance (differential XLR): 120Ω

Headphone output

Range: 4Vp-p

Dynamic range: 105dB

THD: 0.007%

Impedance: 20Ω

Output power: 200mW


User Interface: 32 bit 528MHz ARM Cortex-A7

Audio Processing Unit: Quad core 64 bit 1.2GHz ARM Cortex-A53

Note the audio processing unit is mounted on a removable carrier to allow future upgrades


USB 2.0 compatible

Record and Playback direct from/to master outputs

Upload impulse responses and firmware updates

Download board configurations backup or sharing


Folded galvanised steel panel construction with hard wearing plastic coated finish.

Dimensions: 30 x 24 x 6cm

Weight: 2.6 kg

Three axis joystick with Bourns rotational encoder

Backlit full colour LCD 3.5" 480x320 resolution

Power Supply

Voltage: 9-12V

Current: 1A

Connector: Centre negative 5.5x2.1mm barrel

© 2021 Smooth Hound Innovations Ltd. All rights reserved.  Terms and Conditions  Privacy Policy