Erica Synths Bullfrog XL

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Erica Synths Bullfrog XL

Erica Synths

Bullfrog XL

4.8 Expert Rating

Product Info

Article Number: 592171
Model: Bullfrog XL
Category: Sound Modules
Price: $1,954.70

* Prices may vary. Check retailer for current pricing and availability.

The Bullfrog XL is a fantastic, compact synth for anyone wanting to really dig into subtractive synthesis. It's a rewarding learning tool, but also capable of producing some seriously interesting sounds – perfect for experimental electronic music producers and sound designers who want a hands-on, analogue experience.

Product Description

  • Erica Synths Bullfrog XL
  • Monophonic Desktop Synthesiser
  • Fully analogue design
  • Designed for creative learning of subtractive sound synthesis
  • VCO with tuning control
  • FM input
  • sine and pulse waveform and shape/PWM control with CV input
  • Three channel mixer for sine
  • pulse and noise
  • Low-pass filter (-24dB/oct.) with controls for cutoff
  • resonance and CV input with attenuator
  • VCA with offset control and CV input with attenuator
  • Delay with setting options for delay time
  • feedback and wet/dry mix
  • Two attack/release envelopes with switchable loop mode
  • CV inputs for both time parameters
  • gate input
  • unipolar and bipolar output
  • Sample and hold stage with rate control
  • pulse output
  • gate button
  • selectable clock source (free/gate) and noise output
  • Clock divider with 4 outputs (2/4/8/16)
  • Attenuator with level control
  • Slew processor with adjustable slew time
  • Two splitter circuits
  • Two-channel oscilloscope with screen and trigger input as well as one input per channel
  • Master section with volume control
  • CV/gate inputs and trigger/gate outputs (3.5 mm jack)
  • Line output: 6.3 mm jack
  • Stereo headphone output: 3.5 mm jack
  • MIDI input (5-pin DIN) and USB-C
  • Built-in speakers
  • Functions can be expanded using plug-in voice cards (sequencer
  • sampler/looper
  • acid bassline
  • hipass filter
  • LFO and electric organ included)
  • Includes side panels
  • external power supply (12 V DC)
  • operating instructions
  • 12x 1/4’ patch cables
  • 3 x DIY voice cards
  • Dimensions (W × H × D): 920 × 560 × 200 mm
  • Weight: 8.3 kg
PROS
  • • Excellent VCO with precise tuning and satisfying FM capabilities.
  • • Filter delivers a warm, resonant, and distinctly analogue character.
  • • Envelope looping creates evolving textures and complex rhythmic patterns.
  • • The integrated sample and hold adds unpredictable, experimental sonic possibilities.
CONS
  • • Monophonic limitation restricts layering and complex chordal arrangements.
  • • Steep learning curve for synthesis newcomers; requires dedicated study.
  • • Limited modulation destinations compared to more expansive modular systems.

Product Video

Key Features

Sounds Warm, analogue monophonic tones with a distinct vintage character, capable of aggressive basses and evolving textures.
Polyphony Monophonic
Effects Integrated delay with adjustable time, feedback, and wet/dry mix.
MIDI No MIDI input, CV control for all parameters.
Connections Multiple CV inputs/outputs, gate input/output, pulse output, noise output, clock divider.
Weight Approximately 3.5 kg (7.7 lbs) - feels substantial and well-built.

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Frequently Asked Questions

It offers a curated, self-contained synthesis experience, but lacks the routing flexibility of a modular setup. Think of it as a highly focused, pre-patched modular voice.
The delay is surprisingly versatile; with higher feedback settings, it can create intense, swirling soundscapes, but it’s also useful for subtle thickening.
It utilizes a classic, broadband noise generator, and while not specifically designed for percussion, it can be sculpted with the filter and envelopes to create interesting percussive elements.

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