RD4 – Groovebox 2.1.1 Apk

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RD4 - Groovebox for Android

RD4 – Groovebox v2.1.1 Apk is a music making app with virtual analog synthesizers, drum machines and effects.

Updated: October 24, 2013
Current Version: 2.1.1
Requires Android: 3.2 and up
Category: Music & Audio
Size: 12M

Turn your phone or tablet into a musical instrument! 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. Appropriate both for experienced musicians and beginners.

System Requirements:

  • Android 4.0 or higher
  • Screen resolution 800×480 (WVGA) or higher
  • 1 GHz CPU or faster supporting ARMv7

Loops you’ve created and exported with RD4 can also be automatically integrated into mikrosonic’s audio mixer app SPC – Music Sketchpad.


  • Mixer:
    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
  • Sequencer:
    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
  • Analog
    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 (depending on devices capabilities)
    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
  • Bassline
    Reminiscent of the legendary 303 synthesizer
    Create bubbling basslines and screaming lead sounds
    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
  • Beats
    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 can mute 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:
    Customized layouts for phones, 7 and 10-inch tablets
    Special additional rack view in portrait mode for 10-inch tablets
    Multi-touch control
    Live session recording
    Audio loop export feature
    SoundCloud Sharing Kit integration
    Session save capability
    Cut/copy/paste pattern
    OpenSL support for low latency*

What’s new

  • USB MIDI support, connects external MIDI keyboards and controllers
  • External MIDI clock sync support
  • Automatic MIDI input focus when switching instruments
  • Detailed MIDI Implementation
  • Improved low latency support for devices with a 48 kHz sample rate such as the Nexus 4, htc One, Samsung Galaxy Tab 3
  • Support for x86 CPUs
  • Improved Delay and Filter effect
  • Analog synthesizer: Performance improvement
  • 8 bar loop export fixed

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RD4 - Groovebox 2.1.1 Apk for Android 3

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