OS 1.22 for Analog Keys/Four brings several new features suited for FM oriented sound design and this tasty little Sound Pack is prime example of the new timbral possibilities. What you’ll get are 32 Sounds, all steeped in FM goodness for those unmistakable and edgy harmonics. Harsh, meet beautiful. Please note OS 1.22 is required for this Sound Pack. Please note this Sound Pack was designed for Analog Four MKI. It is compatible with MKII but be advised that there may be slight differences in sound.