K104E
Dual ADSR Envelope Generator
Firmware Version 1.0
Dual Advanced Envelope Generator
Overview
K104E is a Dual ADSR Envelope Generator developed following K102E. Create complex and dynamic tonal changes with 2 independent ADSR envelopes.
Important Notes
• Gate input supports 0-5V
• CV input supports -5V to +5V (10Vpp)
• Output voltage is 0-10V
• Powered from Eurorack bus (16pin) - USB used for configuration only
Technical Specifications
| Item | Specification |
|---|---|
| Width | 18 HP |
| Depth | 35 mm |
| Outputs | 2× CV Output (0-10V), 10-bit electronic linear converter output |
| Inputs | 2× Gate Input (0-5V), 2× CV Input (-5V to +5V, 10Vpp) |
| Power | +12V: 200mA / -12V: 0mA / 5V: 0A |
Front Panel
ENV A (Envelope A, Modulation: High)
Faders
- Attack（起音） - Adjust attack time
- Decay（減衰） - Adjust decay time
- Sustain（持續） - Adjust sustain level
- Release（餘韻） - Adjust release time
- Linearity（直線形狀） - Adjust envelope curve (Exp: Exponential／Lin: Linear／Log: Logarithmic)
Jacks
- Gate IN - Gate signal input (0-5V)
- CV OUT - Envelope output
ENV B (Envelope B, Modulation: Low)
Faders
- Attack（起音） - Adjust attack time
- Decay（減衰） - Adjust decay time
- Sustain（持續） - Adjust sustain level
- Release（餘韻） - Adjust release time
- Linearity（直線形狀） - Adjust envelope curve (Exp: Exponential／Lin: Linear／Log: Logarithmic)
Jacks
- Gate IN - Gate signal input (0-5V)
- CV OUT - Envelope output
CV Total Scale Inputs
- CV IN 1 - Adjust ENV A total scale (-5V to +5V, 10Vpp)
- CV IN 2 - Adjust ENV B total scale (-5V to +5V, 10Vpp)
ADSR Operation
Basic Operation
Envelope Sequence: Gate ON → Attack → Decay → Sustain → Gate OFF → Release → Off
The envelope is generated following the gate signal in this sequence:
- Attack - Rise from gate ON to sustain level
- Decay - Descend to sustain level
- Sustain - Hold specified level
- Release - Descend to 0 after gate OFF
Time Settings
- Attack / Decay / Release - Adjustable from 1ms to 10s
- Sustain - Adjustable from 0V to 10V
Linearity
The Linearity fader changes the envelope curve characteristics:
- Exp（Exponential） - Organic changes close to natural decay
- Lin（Linear） - Mathematically precise, straight-line changes
- Log（Logarithmic） - Sharp rise with unique tension
Hidden Features
Press the Boot tactile switch on the rear panel to cycle through loop modes. Settings are preserved each time you press.
LED Indicator Status:
- Red - Loop mode OFF
- Blue - ENV1 loop only
- Green - ENV2 loop only
- Cyan - Both ENV1 and ENV2 loop
Included Accessories
- 16pin Power Cable (10cm)
- M3 Hex Screws (x4)
Feedback and Support
We welcome your feedback, bug reports, and feature requests:
Last Updated: January 12, 2026 (v1.0)