The RFX-300 has 22 essential time and modulation effects for recording including hall, room, plate, ambience, delay, pitch, chorus, flanger, phaser, comp/limiter, microphone simulator, rotary, cabinet simulator, compression plus de-tune, compression plus delay, chorus plus reverb, flanger plus reverb, delay plus reverb, power mix, wide mix, boost mix, and vocal mix.

Features
44.1 kHz sampling frequency plus 18-/24-bit quantization

Key recording features such as insert, send/return, mixdown, etc.

4 newly developed mixdown effects for professional mastering quality

Standard phone plugs and RCA-type plugs for inputs and outputs

Gain switch for connection of microphones and optimal performance with a multi-track recorder

Easy-access rotary effect selector and parameter controls

Instant fine-tuning for optimum sound quality by simply tapping a key. This allows the real-time setting to match the delay time or modulation rate with the tempo of a song,

Built-in microphone simulator effect that lets the user achieve condenser mic characteristics using dynamic mics. The available variations are "Vocal" with full, well-rounded midrange sound and "Instrument" with the accurate, detailed sound of a condenser microphone.

Dual power supply design for batteries as well as the supplied AC adapter. You can use this unit as a portable vocal effect device or as a mike preamp for recording.