ALM Busy Circuits S.B.G-PRO

Eurorack to line level interface with safe CV expression

10 HP Eurorack module

The S.B.G-PRO is a utility interface module that bridges Eurorack modular systems with external line-level audio equipment such as rack effects, guitar pedals, and mixers. It provides level conversion in both directions, true stereo send/return with balanced 6.35mm connectivity, and an equal-power crossfader for smooth wet/dry blending. Its expression output section with diode-limited 3V and 5V conditioned outputs enables safe CV control of external gear without risking damage.

Features

• True stereo send and return via 6.35mm quarter-inch jacks
• Balanced and unbalanced 6.35mm jack compatibility
• Mono-to-stereo normalling on return inputs
• Up to 32dB of return gain boost
• Clip indication LEDs on return channels
• Equal power crossfader for smooth wet/dry mixing
• CV-controlled crossfading via 0-5V input
• Expression CV input with diode-limited 3V and 5V conditioned outputs
• Included floating ring cable for safe expression output connection to pedals
• Send level attenuation for modular to line level conversion
• Reverse power protection
• Compatible with modular-as-effect and rack-effect-in-modular workflows

Controls & Jacks (17)

• Mix CV
• Dry/Wet
• Mix Out (L/R)
• Modular Dry In L
• Modular Dry In R
• Send Level
• Send Out (L/R)
• Return L
• Return R
• Return Level
• Return Stereo (L/R)
• Clip LED L
• Clip LED R
• Expression In
• 3V Out
• 5V Out
• Return R (TS)

How-To Guides

• Modular Through Rack Reverb
• CV Control of Expression Pedal Input
• Automated Wet/Dry Fading with LFO
• Modular as Mixer Insert Effect
• Stereo Guitar Pedal Integration
• Mono Send to Stereo Return Widening
• Envelope-Controlled Wah or Filter Pedal
• Gain Staging with Clip LEDs

Explore the interactive S.B.G-PRO panel on BleepDex — tap any control to learn what it does.