This is a simple stand-alone OPL2LPT test program. Run it and it will play a little tune. The file opl2test.mp3 contains a reference recording.
Also included is OPL3TEST, a variant that lets you test OPL3 stereo.
The code is adapted from Maarten Janssen's ArduinoOPL2 project.
Copyright (c) 2016-2017 Maarten Janssen
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