Here's what they say about it:
The Minisynth series collection consist of three instruments: FRET, GRIT and PEAK. As an overall concept, Acrobatics simplified controls and packed implementations to the highest grade to push-up users creativity first and give steady look and maximum usability to the three polyphonic synthesizers. A reasonable set of sounds for each synth is included.
FRET is an accurate reproduction of phase modulation synthesizers of the eighties: reproduces pianos, basses, organs and bells patches with ease, and it can explore wild and spacey atmos using alternative programming.
GRIT is voted to pulses, PWM and organ-like sounds: uses a proprietary mix of phase distortion principles in order to produce its sounds. It is the dirty of the family, watch out for massive aliasing and punchness.
PEAK is the analogue baby of the lot. Classic acid and house tones are at hand. Here the LFO addresses pitch of a clean square or sawtooth waveform with typical Minisynth series advanced modulation extras.
Common look and feel and standardized location of knobs and switches goes in the direction of helping musician when in a busy musical work, when he/she certainly requires instant access to basic synthesis controls and settings to fit in the mix. The Minisynth series collection is also suitable for educational purposes for its separate interpretations of most important synthesis methods and applications.