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5U Synthesizer Modules

This section contains utility modules that provide routing, attenuation, passive multiplication and other utility functions that make up a complete synthesizer system. Blank panels are also provide to fill extra module spaces until they are needed.

GMS-724 Multiples

The GMS-724 Multiples module can be used as two 1 In/6 Out or four 1 In/3 Out multiples.

GMS-904 Quad Attenuator Voltage Source

The GMS-904 Quad Attenuator contains four passive attenuators in a 1MU panel. Each attenuator's input connector has a normalized switch selectable voltage source.

1MU Blank Panel

Single width MU-style blank panel for 5U cabinets.

2MU Blank Panel

Double width MU-style blank panel for 5U cabinets.


We produce electronic synthesizer modules in the two most popular formats, MU (Moog compatible 5U) and EU (Eurorack compatible 3U). A wide range of voltage controlled modules including oscillators, amplifiers, mixers, envelope generators, special effects units, wave generators, filters, power systems and cases allow  users complete freedom to configure any desired electronic music instrument. 


Grove Audio builds microphones, preamplifiers, equalizers, compressors and other professional audio equipment for performance and studio use. We build units in popular formats such as 19 inch rack mount and 500 series 3U modules. We can also produce custom designs on request. Contact us for a consultation. 


A wide range of electronic parts, kits, tools and accessories is available on the Strange Hardware site. Fast order response, free shipping specials and prompt service will get you the parts you need for your building, restoration or repair projects. You will find high tech hardware sure to inspire the inventor in you. 


You can explore all of our products, download spec sheets, and purchase our products in the Grove Audio Synth Store. You can also learn about our periodic specials and new product introductions. Click the button below to go directly to the store.


256 N Main St.
Cottage Grove WI 53527

Phone: 608 886-6503

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