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NuRack is an AUv3 based multi-channel audio effects processor with a difference, it actually allows you to design your own custom effects using the building blocks provided.

New version 1.22
Old version 1.21
Release Notes v1.22 Added power button to LFO module. In standalone mode you can now enable the input/mic using the 'Monitor' option. In standalone mode you can now connect Bluetooth MIDI devices. Added a NuRack MIDI in port for standalone mode. When running on the iPhone the Interface Builder tools palette is now 25% smaller. You can now pinch to zoom even when an effect is zoomed. The 'Reset Layout' option now tiles effects into the frame. v1.21 Added a new MIDI Strummer module. Added a simple SoundFont player module. Fixed an issue loading presets inside AudioBus 3. Fixed a display glitch in the audio pool which caused overlapping graphics. Other minor bug fixes.
Author 4Pockets.com
Type Effect
Effect type All-in-one
Supports Audio Unit (AU)

The Sound Master Custom Tube Guitar Amplifier plugin is born to reproduce in your virtual rig the classic American guitar amplifier sounds.

New price $9.99
Old price $19.99
Author Nembrini Audio
Type Effect
Effect type Distortion, Drive etc., Guitar effects
Supports Inter-App Audio (IAA), Audio Unit (AU)

SynthJacker is an autosampler for iOS. It automatically plays back a MIDI sequence with the notes and velocities you specify, and records the results into an audio file. It then slices the audio into individual sample files, ready to import into an iOS sampler app of your choice.

New version 0.8.2
Old version 0.7.1
Release Notes - Fixed a problem with hardware sample rates. Previously SynthJacker would try to set the hardware sample rate to 44.1 kHz. On newer devices the sample rate is fixed at 48 kHz. This could result in samples being out of tune. - New sample post-processing engine with better visual feedback. - Added input level meter. - Note sequence name now follows the selected factory preset on instrument Audio Units. - Added option to clean up temporary files (in Settings menu). - Added alert for missing microphone permission, in case it was turned off after it was initially granted.
Author Conifer Productions Oy
Type Tool
Supports Audio Unit (AU)

Visual EQ Console is a multi-band EQ console with the ability to analyse audio in real time giving a spectrum representation of the frequency response. 

New price $4.99
Old price $5.99
Author 4Pockets.com
Type Effect
Effect type Equalizer, Filter
Supports Audio Unit (AU)

New version 20.11.0
Old version 20.10.0
Release Notes IMPROVED: Mobile only workflow - now supports copying of additional filetypes (zip/sf2/wav/mid/tg/fxm/wotjarp) into the Wotja iCloud Folder via the Files app; either A) force tap a file and select Share or B) select a file and then tap the Share button, then C) for either select "Open in Wotja". IMPROVED: iPad pop-up menu item spacing for Settings > General > Use Standard Pop-up Menus > OFF; Tip: if you are having issues with slow or non-responsive menus then try using this Setting set to OFF. FIXED: Main bottom tab button highlighting when selected. FIXED: Issue on iPad when using Non-standard Pop-up menus where selection of "Cancel" from a Document close button pop-up menu would be treated as "Discard". FIXED: iPad non-responsive UI issue when using Non-Standard Pop-up Menus and returning to Documents screen. FIXED: A few other bugs. If anything is not working right then please do get in touch via our Help Page 'Contact Us' options. P.S. Enjoying Wotja? Please do leave or update a positive review and rating - your love means so much to us! Thank you :).

Vector is the swiss army knife of digital audio. Record audio, edit existing audio files, convert your music between the most common audio file formats, digitize your old vinyl records or record internet radio stations*.

New version 3.7.4
Old version 3.7
Release Notes -fixed minor bug with new file dialogue -fixed a compatibility issue with some audio formats
Author Jaroslaw Szpilewski
Type Host
Supports Audio Unit (AU)

Dual VCF adds motion, shape, and colour. It produces evolving rhythmic movement and complex dynamic filter shapes.

New version 1.5.4
Old version 1.5.3
Release Notes Improved sound quality / anti-aliasing and oversampling filters
Author ToneBoosters
Type Effect
Effect type Equalizer, Filter
Supports Inter-App Audio (IAA), Audio Unit (AU)

Visual Compressor is a 4 band compressor/expander which has the ability to analyse audio in real time giving an accurate and reliable spectrum representation of your signal as well as visual feedback of compression or expansion levels.  It's uses range from final mastering of songs to dynamic manipulation and EQing of drum tracks.

New price $4.99
Old price $7.99
Author 4Pockets.com
Type Effect
Effect type Compressor, Limiter, Gate
Supports Audio Unit (AU)

Koala is the ultimate pocket-sized sampler. Record anything with your phone's mic instantly. Use Koala to create beats with those samples, add effects and create a track!

New version 1.379
Old version 1.378
Release Notes MIDI MAPPING UPDATE!! (take 2) * Midi map effects, transport, tempo sequence and some sample controls * Hold and loop can both be enabled at the same time * Custom background image chooser * Edit a pad without triggering it (hold EDIT and press pad) * Improved effects quality * Added sort options for LOAD screen * Fixed intermittent crash when exporting stems * Landscape mode on iPhone * Updated AudioBus library to latest version * Enabled QWERTY keyboard shortcuts for iPad (same as the Mac ones)
Author Mazbox Limited
Type Instrument
Instrument type Sampler
Instrument sounds Other
Supports Audiobus, Ableton Link

Now available as an Audio Unit extension (AUv3) allowing it to act as a powerful MIDI sequencer and clip launcher.

New version 1.7.6
Old version 1.7.5
Release Notes - More clip follow actions (MATRIX MIDI Mode) - Clip play state saving (MATRIX MIDI Mode) - Aims to fix crashes
Author Imaginando Lda
Type Tool
Supports Audio Unit (AU)

Vector is the swiss army knife of digital audio. Record audio, edit existing audio files, convert your music between the most common audio file formats, digitize your old vinyl records or record internet radio stations*.

New version 3.7.4
Old version 3.7.0
Release Notes -fixed minor bug with new file dialogue -fixed a compatibility issue with some audio formats
Author Jaroslaw Szpilewski
Type Host
Supports Audio Unit (AU)

JAX Unisonic is a special Audio Unit, able to produce up to 8 additional voices from any audio input.

New price $14.99
Old price $22.99
Author Jens Guell
Type Effect
Effect type Pitch effects
Supports Audio Unit (AU)

Pure Synth® Platinum is a full-blown rompler/synthesizer for your iOS device. Neither the synth engine or the sample engine is an afterthought: Both engines are fully capable and feature-rich. The romper section contains a well rounded assortment of analog, synth, string, digital, and acoustic instruments.

New version 2.4.13
Old version 2.4.12
Release Notes Fixed No Sound issue in AUv3 DAWs
Author MIDIculous LLC
Type Instrument
Instrument type Sampler, Synth
Instrument sounds Keyboards, All-in-one
Supports Inter-App Audio (IAA), Audio Unit (AU)

Koala is the ultimate pocket-sized sampler. Record anything with your phone's mic instantly. Use Koala to create beats with those samples, add effects and create a track!

New version 1.378
Old version 1.374
Release Notes MIDI MAPPING UPDATE!! * Midi map effects, transport, tempo sequence and some sample controls * Hold and loop can both be enabled at the same time * Custom background image chooser * Edit a pad without triggering it (hold EDIT and press pad) * Improved effects quality * Added sort options for LOAD screen * Fixed intermittent crash when exporting stems * Landscape mode on iPhone * Updated AudioBus library to latest version * Enabled QWERTY keyboard shortcuts for iPad (same as the Mac ones)
Author Mazbox Limited
Type Instrument
Instrument type Sampler
Instrument sounds Other
Supports Audiobus, Ableton Link

The Vocal Harmonizer plugin was specifically designed for adding harmonies and basic auto tuning frunctionality to recorded vocal lines. It is specifically tuned to the frequency range of the human voice and tracks the incoming vocal frequency attempting to tune to the desired musical key and mode of your song.

New price $5.99
Old price $6.99
Author 4Pockets.com
Type Effect
Effect type Vocal effects
Supports Audio Unit (AU)

A 6 channel drum synthesiser & sequencer for creating beats, electro rhythms or just wacky drum synth blips.

New price $1.99
Old price $2.99
Author Rob Wilmot
Type Instrument
Instrument type Sampler
Instrument sounds Drums, Percussion
Supports Inter-App Audio (IAA), Audiobus, Ableton Link

NuRack is an AUv3 based multi-channel audio effects processor with a difference, it actually allows you to design your own custom effects using the building blocks provided.

New version 1.21
Old version 1.20
Release Notes Added a new MIDI Strummer module. Added a simple SoundFont player module. Fixed an issue loading presets inside AudioBus 3. Fixed a display glitch in the audio pool which caused overlapping graphics. Other minor bug fixes.
Author 4Pockets.com
Type Effect
Effect type All-in-one
Supports Audio Unit (AU)

Connects to Philips Hue, LIFX, and Nanoleaf Aurora to interact with your lights in tons of different ways.

New version 8.0
Old version 7.1.11
Release Notes -NEW for v8.0: Content manager and cloud sharing features -Share custom content, including playlists, effect sheets, and custom effects, with other users on the Light DJ Network -Browse and download community content and add it to your own config -Tap the content icon to get started -Fixed issue with Nanoleaf Shapes Hexagons not working with certain effects
Author NRTHRNLIGHTS, LLC
Type Tool
Supports Ableton Link

BLEASS Flanger is a flanging effect offering a wide range of synchronised modulations which colours sound in a novel and unique way thanks to its complex algorithmic combinations.

Author BLEASS
Type Effect
Effect type Chorus, Flanger, Phaser etc.
Supports Audiobus, Audio Unit (AU)

Connects to Philips Hue, LIFX, and Nanoleaf Aurora to interact with your lights in tons of different ways.

New version 8.0
Old version 7.1.11
Release Notes -NEW for v8.0: Content manager and cloud sharing features -Share custom content, including playlists, effect sheets, and custom effects, with other users on the Light DJ Network -Browse and download community content and add it to your own config -Tap the content icon to get started -Fixed issue with Nanoleaf Shapes Hexagons not working with certain effects
Author NRTHRNLIGHTS, LLC
Type Tool
Supports Ableton Link