Detail 01
Dual-channel oscilloscope
Two oscilloscope inputs plus a trigger input are provided; display modes include scope, Lissajous figures and a math channel.
Product detailSKU #1500000474624
Erica SynthsBullfrog XL Analog Desktop Synthesizer - USA Plug
modernelectronicpop
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Independent shopping perspective
The Korena take
A fully analog desktop synthesizer that combines subtractive synthesis, modular-style utilities and a built-in dual-channel oscilloscope for hands-on sound design and visual learning.
Strong match
Who this is for
- Producers exploring analog subtractive synthesis
- Educators and classrooms teaching sound design
- Sound explorers using patch-based modulation and voice-card expansion
- Studio or experimental performance setups
Consider the trade-offs
When to look elsewhere
- Users who do not need patch-based sound design or visual oscilloscope feedback
- Users seeking an instrument without modular-style utilities
What matters in use
The specifications, translated
Catalog numbers tell only part of the story. These are the details most likely to change how this product feels, sounds, or fits into a setup.
Detail 02
Envelope generators
Two ASR envelopes offer free, gated and loop modes.
Detail 03
Clock divider
It provides /2, /4, /8 and /16 outputs.
Detail 04
Voice-card expansion
A dedicated voice-card slot is included, along with listed voice cards and three DIY voice cards.
Final check
Know before you order
- 01It uses 1/4-inch patch sockets throughout the system.
- 02The supplied power adapter is 12V DC.
- 03USB-C is specified for firmware updates and extended functionality.
- 04Included voice cards are sequencer, sampler/looper, acid bassline, high-pass filter, LFO and electric organ.
Product questions
Before you decide
Straight answers to the questions shoppers most often ask about this product.
01Is Bullfrog XL fully analog?
Yes. It has a fully analog signal path and uses analog subtractive synthesis.
02Does Bullfrog XL include an oscilloscope?
Yes. It has a built-in dual-channel oscilloscope with scope, Lissajous and math-channel modes.
03What MIDI and USB connections are included?
It includes a DIN5 MIDI input and USB-C for firmware updates and extended functionality.
04What is included in the box?
Bullfrog XL with side panels, a 12V DC power adapter, user manual, 12 patch cables, voice cards and DIY voice cards.
Reference
Full specifications
The complete catalog record, organized around the decisions musicians make when comparing gear.
2 detailsSound
- DIY voice cards
- 3 included
- Included voice cards
- Sequencer, sampler/looper, acid bassline, highpass filter, LFO and electric organ
1 detailsBody & build
- Color
- White
5 detailsConnections & power
- CV input
- CV input
- Gate input
- Gate input
- Gate output
- Gate output and trigger output
- Audio outputs
- Main output
- MIDI input
- DIN5 MIDI input
38 detailsOther
- Envelope modes
- Free, gated and loop modes per envelope
- Oscilloscope type
- Built-in dual-channel oscilloscope
- Tracking
- Accurate 1V per octave tracking over more than 8 octaves
- Mixer
- Three-channel audio mixer with sine, pulse and noise inputs
- Synthesis type
- Analog subtractive synthesis
- Power supply
- 12V DC power supply included
- Master volume
- Master output level control
- Patch points
- 1/4" patch sockets throughout system
- Delay
- Analog-style delay with adjustable time and feedback
- Design
- Fully analog signal path
- Accessories
- Bullfrog XL synthesizer with side panels, 12V DC power adapter, user manual, 12 patch cables, voice cards and DIY voice cards
- Tier
- new
- Oscillator
- 1 voltage-controlled oscillator
- Envelope generators
- 2 looping attack-sustain-release envelope generators
- Slew processor
- Slew limiter with adjustable slew time
- Inputs
- Two oscilloscope inputs with trigger input
- Category Source
- detail
- Splitter
- 2 buffered splitter circuits
- Filter type
- Resonant lowpass voltage-controlled filter
- USB
- USB-C for firmware updates and extended functionality
- Voice card slot
- Yes
- Product type
- Analog educational synthesizer
- Waveforms
- Sine and pulse with waveshaping and PWM
- Display modes
- Scope, Lissajous figures and math channel
- Korena Special
- false
- Math functions
- Signal add and multiply
- Manual gate
- Manual gate button
- Dimensions (WxHxD)
- 36.2" (91.95 cm) x 22.0" (55.88 cm) x 7.9" (20.07 cm)
- Weight
- 18.3 lb. (8.30 kg)
- Product Type
- Analog educational synthesizer
- VCA
- Voltage-controlled amplifier with adjustable offset
- Sample and hold
- Sample and hold circuit with independent clock
- Attenuverter
- Bipolar attenuverter for CV and audio signals
- Model
- Bullfrog XL
- Resonance
- Self-oscillation capable
- Source Id
- site51500000474624
- Divider
- Clock divider with /2, /4, /8 and /16 outputs
- Noise generator
- Zener diode-based noise generator
Complete your setup
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