Bubblesound — HexVCA

Manual PDF

HEXvca (Bubblesound) Cheat Sheet

Overview:
The Bubblesound HEXvca is a 7HP eurorack module featuring 6 independent VCA channels with flexible mixing and voltage-controlled features. Suitable for both audio and CV signal processing.

Quick Start

Channels: 6 independent VCAs
Mix Outs: 3 mix outputs (1-3, 4-6, and all 1-6)
CV Response: Switchable per channel (Linear/Exponential)
CV Normalization: Jumpers on the back to chain CV control over multiple VCAs
Expansion: Back header allows for ribbon cable connection with HEXar (triggers VCAs), future-proofed audio input header for cableless connection

Controls

Front Panel

(Assumed Typical) Per Channel:
- Input Jack: Patch in your audio or CV signal
- CV In Jack: Patch control voltage (envelope, LFO, etc.) here
- Typical voltage range: 0V (off) to +5V (unity/max VCA response)
- CV Response Switch: Toggle between Linear and Exponential VCA behavior
- Output Jack: VCA output for each channel
Mix Outputs:
- 1-3 Mix Out: Sums channels 1, 2, 3
- 4-6 Mix Out: Sums channels 4, 5, 6
- 1-6 Mix Out: Sums all six channels

Rear Panel / Internal Jumpers

CV Normalize Jumpers: Set for cascading gate/EG control between VCAs
Ribbon Cable Header: Connect to HEXar for gate/trigger control (no patch cables needed)
6-pin Audio Input Header: For future expansions

Signal & Voltage Reference

All VCAs are DC-coupled: Accept audio and CV signals
CV In Range: 0–5V (typical – check for max input in module test)
VCA Response:
- Linear: Best for CV and control purposes
- Exponential: Ideal for audio dynamics (musical VCA behavior)

Power & Mechanical

Width: 7HP
Depth: 30MM
Power Consumption: +50mA / -45mA

Inputs & Outputs Reference

Jack	Function	Typical Voltage Range
Channel IN (1-6)	Audio or CV input	-10V to +10V (typical)
Channel CV IN (1-6)	Voltage control over VCA gain	0V to +5V
Channel OUT (1-6)	Individual channel output	-10V to +10V
1-3 MIX OUT	Mix of channels 1, 2, 3	-10V to +10V
4-6 MIX OUT	Mix of channels 4, 5, 6	-10V to +10V
1-6 MIX OUT	Mix of all 6 channels	-10V to +10V

How To Use

Patch audio/CV sources to Channel IN jacks.
Patch CV (envelope, LFO, step) sources to Channel CV INs.
Select desired VCA response (linear/exp) per channel.
Take outputs from individual OUTs or from MIX OUTs as needed.
For advanced chaining, use rear jumpers/ribbon for CV normalization or expansions.