ADSR Sounds is offering discoDSP’s emulation of the OPL sound chip for free with any purchase at its store through the end of the month.

The OPL FM synthesizer plugin provides all features of the OPL2, and some features of the OPL3, two of Yamaha’s FM Operator Type-L series sound chips which were developed to provide FM synthesis for use in computer applications.

The OPL is a digital sound synthesis chip developed by Yamaha in the mid 1980s. Among other products, it was used in sound cards for PC, including the Ad Lib card and early Sound Blaster series.

Regularly priced $49 USD, the OPL plugin for Windows and Mac (VST/VST3, AU and AAX) is free with a purchase until September 30th, 2022.

More information: ADSR Sounds