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This VST3 is a virtual-analog simulation of the famous Bass Driver DI Version 1 preamp pedal from Tech21. The discretization, while far from being exact, is moderately close to the original.

The potentiometers are identical to these physically present on the BDDI pedal, apart from the pregain which is specific to this digital version.

Download development builds


  • Jean Pierre Cimalando: circuit analysis and implementation
  • Julien Taverna: circuit analysis and testing

How to build

git clone --recursive
mkdir Bass21/build
cd Bass21/build
cmake -DCMAKE_BUILD_TYPE=Release ..
cmake --build .