Enclosures PreenFm2 official metal enclosure. This is the official metal enclosure for PreenFM2 polyphonic FM synthesizer. You can get the kit from Xavier PreenFM Homepage Graphics is designed by Papernoise Cases are available in store! Audiothingies P6 metal enclosure This is a metal enclosure for P6 polyphonic synth. You can get the DIY KIT from Audiothingies Discontinued!