TB-303 inspired Envelope, Filter and Amp
https://geosyncsynth.com/2022/04/12/tb-efa/
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TB-303 inspired Envelope, Filter, and AmpTB-EFA takes the entire post-oscillator voice circuits from the 303 and brings it to Eurorack.The 3-and-a-bit pole low pass filter, the envelope, and the VCA are all from the original 303, including the classic Roland BA662 op-amp utilizing the OML clone.The module provides the same features as the TB-EF, but with the VCA also included, you get full control over the decay of the envelope, and the envelope controls not only the filter modulation but amplifier modulation as well.The TB-EFA includes two additional controls: the envelope's decay and the filter's width. The width allows you to control the extent to which the filter mashes up the sound. From subtle to shrill, the options are endless.
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