TB-EFA

TB-303 inspired Envelope, Filter and Amp

TB-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 all from the original 303 including the classic Roland BA662 op-amp by means of 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 as well as the envelope controlling not only the filter modulation but amplifier modulation as well.

The TB-EFA includes two additional controls, the decay of the envelope and the width of the filter. The width allows you to control the extent to which the filter mashes up the sound, from subtle to shrill, the options are endless.

https://geosyncsynth.com/2022/04/12/tb-efa/