Downloading ExpressFX1 1.0 from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this software available. We recommend checking the downloaded files with any free antivirus. The most popular version of the tool is 1.0. The program lies within Multimedia Tools, more precisely Music Production. You can execute this PC program on Windows XP/7/8/10/11 32-bit. The actual developer of the software is Sony Creative Software, Inc.
From the developer:
ExpressFX1 is a DirectX audio plugin that provides streamlined effects for use with Sound Forge XP 4.5 and ACID Music 1.0. Each effect provides parameter adjustments to give you precise control over your sound processing. It offers Distortion, Flange/Wah-Wah, Reverb, and Stutter effects.
You may want to check out more software, such as Virtual Guitarist 2, Voxengo LF-Max VST or Virtins Sound Card MultiInstrument, which might be similar to ExpressFX1.