The LFO section is a pretty standard LFO with waveform, rate and depth. The PROG section is where you choose which oscillators are switched on, how influential the LFO is, how much white noise is in the tone and how much feedback is present in the modulator signal path (more details below). This allows for progressive and varied note fades and/or more detailed and evolving FM tones. The ADSR has an additional decay between sustain and release, i.e.
The OP section is where you manipulate the tone by controlling the level and dynamic (ADSR) of carrier and modulator oscillators. VOPM is an FM synth with two sine wave oscillators and two sine wave modulator oscillators. Mac Compatible SEGA Mega Drive/Genesis Game Music Patches SEGA Mega Drive/Genesis Game Music Patches (Windows Only) Original VOPM download site (Windows Only) If you haven’t got VOPM yet, go get it!!! Then we figured it makes a lot more sense to share our guide online for anyone else who wants to better understand this awesome synth. We tried to keep it simple, hopefully a basic understanding of the principles of FM synthesis should be enough for you to understand what’s going on. The instruction manual was in Japanese, but we found some useful tips in other places online and figured some things out for ourselves and made the following guide for ourselves. But it’s fair to say, we didn’t really fully understand what we were doing and wanted to delve deeper. We spent an evening playing with it, knocked out a little jam and had some fun. Last year it was recompiled for Mac in both 32 and 64 bit compatibility and best of all for us, as an AU compatible with Logic Pro. It has always been available for PC however running it on an Apple Mac has always been problematic. It is free to download and emulates the Yamaha YM2612 sound chip used in the SEGA Mega Drive/Genesis. This software synth has been around for years.
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