RRS Ivoks is a powerful AUv3 instrument designed for iPhone users. It offers a wide range of features and functionalities that make it a versatile tool for music production. The app comes with a time-limited demo version that allows users to try it out for 5 minutes of free play time. For unlimited access, users can purchase the full version of RRS Ivoks as an in-app purchase.

The main features of RRS Ivoks include two audio-frequency oscillators, OSC1 and OSC2, which offer frequency band regulation, five waveforms, and controls for LFO modulation level and OSC2 cross-modulation. The app also includes a mixer with level controls for the oscillators, noise generator, and saturation drive.

The filter block of RRS Ivoks features an ADSR envelope that can be switched to a repeating AD-envelope. It offers controls for cutoff, resonance, LPF to BPF switch, modulation level, and envelope level. The amplifier block also includes an ADSR envelope, along with modulation level and velocity sensitivity control.

In addition to these features, RRS Ivoks provides modulation (LFO) controls, a mode with four waveforms, including noise, and a stepped function for sample & hold effects. The app also offers global settings such as master tune, master volume, legato mode, monophonic and duophonic operation, unison switches, and glide control.

To use RRS Ivoks as an instrument, users need an AUv3-compatible host app like GarageBand, Auria, AUM, Cubasis, and more. RRS Ivoks will appear in the list of audio unit instruments in the host app.

Overall, RRS Ivoks is a feature-rich AUv3 instrument that offers a wide range of controls and functionalities for iPhone users. Whether you're a professional musician or a music enthusiast, RRS Ivoks provides you with the tools you need to create unique and high-quality music.