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Like the [[Eurorack]] format, Frac is considered a [[3U]] format. The height of most modern modular synthesizer modules is measured by the number of vertical units it consumes in a standard [[19-inch rack|19" equipment rack]]. Modules conforming to the 3U format will take up three vertical units in a 19" equipment rack. Each vertical rack unit is 1¾", so a 3U module is 5¼" (133.35 mm) tall. The Frac format has a standard width unit of 1½". So 3" (76.2 mm) and 4½" (114.3) wide modules are common in this format.<ref name="measures" />
== Difference between Frac rack and Eurorack ==
Although both Frac and Euro modules are 3U, use V/octave (CVs are compatible) and have basically the same signal levels the modules aren't interchangeable. Differences exist in the mounting system. The power connectors are different. Frac modules are powered with ±15V and Eurorack with ±12V.<ref name="an" /><ref name="faq">[http://www.blacet.com/FAQ.html Blacet FAQ]</ref><ref>[http://www.blacet.com/tech.html Tech Notes], Blacet Research</ref><ref>[http://forum.vintagesynth.com/viewtopic.php?f=5&t=71748 Difference between Frac rack and Euro], Vintage Synth Explorer forum, May 2013</ref>
== Patching ==
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