Frap Tools - 321


There is always something to do for the 321! The module’s three channels can be used to amplify audio signals or control voltages by up to +6 dB, flip their phases and add DC offsets. On top of that, the circuit is capable of generating control voltages itself. This allows you to utilize the 321 as a (macro) controller, meaning parameters of several other modules can be adjusted mutually. Furthermore, is is possible to use the 321 as a mixer. – A very clever and compact tool!



The 321 is entirely DC-coupled, meaning the module can be used for processing audio material as well as control voltages. There are three identical channels. Each of them comes equipped with the following control elements:

  • Level potentiometer allowing users to amplify signals by up to +6 dB
  • Switch for inverting the channel's phase
  • A DC offset potentiometer with on / off switch

As long as a signal input isn’t patched, the corresponding DC offset generator operates as a CV source. Besides individual outputs, there are two sum outs with attenuation switches (-6 dB). One of these connectors emits a mix of all processed signals. The other provides voltages generated by the 321 module itself.


Input and output per channel
Two mix outputs


3U Eurorack module, 6 HP wide, 38 mm in depth
Power consumption: 48 mA at +12 V and 48 mA at -12 V

0.15 kg
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€ 19% VAT excl. €83.19 € 19% VAT incl. €99.00
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