0 comments on “RD4 – Groovebox comes to iOS”

RD4 – Groovebox comes to iOS

Mikrosonic bring their Android app RD4 to the iOS platform as a universal app. Here’s what to expect …

Turn your iPhone or iPad into a musical instrument! RD4 – Groovebox is a music making app with virtual analog synthesizers, drum machines and effects.

Compose and arrange your music in real-time. Choose instruments individually for the 4 channels. Record live or set notes with the dedicated sequencer or piano roll of each instrument.

This multi-touch enabled app makes it simple to invent unique loops and musical phrases. Manipulate the sound of the synthesizers by tweaking the oscillators, resonant filters and audio envelopes. Add audio effects like reverb, distortion, phaser, filter and delay to your sounds.

Feature Overview


  • 4 channel rack mixer
  • Instrument selection for each channel
  • Volume control with level meter per channel
  • Direct audio effect channel assignment
  • Tempo control with tap tempo
  • Channel mute and solo


  • 2 banks with up two 8 bars per instrument
  • Adjustable play modes from 1 to 8 bars and random modes
  • Song Mode with a length of up to 99 bars

Choose between two virtual analog synthesizers and the drum machine for each channel:


  • Modeled after legendary monophonic synths of the ’70s
  • For fat sounding bass and powerful lead sounds
  • 3 oscillators with 6 different waveforms
  • Each oscillator can be tuned precisely and has a warmth control for the typical analog sound
  • Attack, Decay, Sustain and Release envelope generator
  • Pitch wheel
  • Low-pass filter (24dB/oct, 4-pole) with knobs for cutoff, resonance and an Attack/Decay/Sustain envelope generator

  • Recording of played notes in real-time
  • Piano Roll for editing recorded notes comfortably
  • Or compose by drawing notes directly with the piano roll in 1/16 or 1/32 resolution
  • Piano roll editing features: Transpose Pattern, Shift Sequence and Quantize Pattern


  • Reminiscent of the legendary 303 synthesizer
  • Create bubbling basslines and screaming lead sounds
  • Successor of the famous synthesizer Rubberduck from d-lusion
  • High-quality low-pass filter with resonance, cut-off, and envelope controls
  • Oscillator with 4 types of waveforms
  • Real-time step sequencer with accent and slide


  • Program beats with 10 classic drum kits: 808, 909, 606, CR-78, Linn, KR55, RX11, RZ1, DMX, DPM48
  • Booming kick drums, snappy snares and throbbing percussions
  • 8 channels per drum kit
  • Punch control for volume and envelope adjustments
  • Accent programmable for each drum channel
  • Free assignable effects for each drum sound
  • Channel mute, Closed Hi Hat mutes the Open Hi Hat
  • Real-time pattern based step sequencer

Audio effects:

  • 5 effects: Reverb, distortion, filter, phaser and delay
  • Real-time controllable
  • X/Y control field for each effect
  • 4 effect sends
  • Chaining of 2 effects

Technical features:

  • Multi-touch control
  • Live session recording
  • Audio loop export feature
  • SoundCloud Sharing Kit integration
  • Session save capability
  • Cut/copy/paste pattern

RD4 is priced at $7.99.

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