Update: StepPolyArp v2.1 Adds Audiobus
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StepPolyArp Arpeggiator For iPad

StepPolyArp is a real-time Midi arpeggiator to control Midi instruments, sequencers like Logic, Cubase, Live, and all other Midi sequencers, or even other virtual instruments installed on the same iPad. The arpeggiator can automatically generate melodic patterns from notes or chords played in real time.

What’s New in Version 2.1

• Audiobus support


• 1 to 32 steps programmable matrix
• 16 patterns by preset
• Automatic chaining patterns
• 11 configurable transposition lines
• Features copy and paste
• 8 octaves virtual keyboard
• Multitasking
• Internal sound bank
• Tap tempo
• Receiving Midi notes and control from external devices
• External Midi sync (Midi Clock)
• Midi over wifi latency compensation
• Internal routing of inputs, outputs and Midi sync
• Send Midi to a virtual port that can be used as Midi input by other Core Midi compatible applications managing multitasking on the same device
• Velocity, modulation, pan, volume, aftertouch and pitch bend step controller
• Customizable step controller Midi datas
• The arpeggiator and keyboard fit the selected scale
• 6 arpeggiator modes
• 1 random mode
• 1 chord mode
• Unlimited number of saves
• Random patterns creation
• Presets manager
• Presets shared between computer and iPad using iTunes 9.1 or later
• 128 Undo/Redo levels
• Lockable keyboard (latch mode)

StepPolyArp is available for $11.99.

Runxt XY for iPhone and iPad
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Runxt XY Pad For iOS

With Runxt XY you can easily turn your favorite iOS device in a XY MIDI Controller. Connect your iOS device via CoreMIDI to your Mac or via rtpMIDI on Windows. Ableton users can easily attach the x- and y-axis to a parameter via MIDI Learn by pressing the colored knobs below the xy-pad. These also function as a ‘floor it / pedal to the metal’ button.


4 different XY Modes including: Classic XY, Joystick 2-Param, Joystick 4-Param and Bounce!
Select MIDI output channel per mode
Choose MIDI Control Change Number per parameter
Easily allow MIDI Learn by pushing the knobs

Runxt XY is available for $0.99

Automatically Add Harmony To Your Riff with Midi Mind
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Midi Mind

MIDI INTERACTIVE NOTE DEVICE – Allows a MIDI input to produce a multiple output of Harmonies and rhythm, based on the users defined parameters.

A real-time performance and compositional tool. Highly human in response, function and intention.

What’s New in Version 1.10
• MIDI IN & OUT are separately selectable
• Multiple MIDI OUT(s) can be selected
• Virtual MIDI IN & OUT available
• Keyboard function extended
• More Octaves available in Keyboard output
• Harmonies shown on Keyboard output page

Core MIDI compliant

What’s New in Version 1.00
releasable version …
1) Graphics updates
2) Debugging turned OFF
3) Variable sized Keyboard
4) Play mode screen includes SUS Pedal, PitchBend and Velocity control
5) Scale page shows scale order in place of Part order
6) Rhythm page viewable
7) Presets default, saved and used indicated by colours

Midi Mind is available for $12.99

UPDATE: Polychord Ver 2 9 Adds AudioBus
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Polychord iPad App Logo

Performable. Recordable. Polychord 2. A musical instrument for experts and beginners alike. Write songs, play music, record and share.

What’s New in Version 2.9

Audiobus support and major optimizations.

Introducing Audiobus support: Now you can stream live audio directly to other Audiobus-compatible apps.

We’ve also optimized every single aspect of the polychord’s audio routines, freeing up more CPU cycles for your device.

Hit any of the chord circles to play a chord. Slide your fingers over the strum keys and play the notes. Go from Major to Minor. Switch Keys. Play a scale. Turn on auto accompany and play along to drums, bass, and an arpeggiator that has a whole range of time-signatures to choose from.

Turn on MIDI for any of the instruments in polychord, and use it as a powerful controller for your favorite audio programs.

Like chiptunes and 8-bit music? Polychord has bitshift effects, including detailed controls for the drums. Decimate and distort your sounds with full control over bits and bitrate.

Polychord is available for $9.99.

Johannes Dorr iMidiPatchbay For iOS
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iMidi Patchbay iPad

iMIDIPatchbay lets you organize your whole MIDI setup from one central point. As a keyboard player, you most probably know about splitting and layering sounds. While this can be done relatively easy on professional keyboards, it becomes more complex if your gear consists of multiple keyboards and sound expanders.

iMidiPatchbay Screenshot



List of features

Create split and layer configurations very easily
Send volume and other control changes to your sound devices
Send program changes to your sound devices
Transpose sounds in octave steps
Filter controller data (sustain, pitch bend etc.)
Store configurations as programs for later recall
Switch programs of iMIDIPatchbay from another app or MIDI device via program changes
Switch programs while holding down keys or holding e.g. the sustain pedal without getting stuck notes
UI which is optimized for live usage
What exactly can I do with iMIDIPatchbay?

As a keyboard player, you most probably know about splitting and layering sounds. While this can be done relatively easy on professional keyboards, it becomes more complex if your gear consists of multiple keyboards and sound expanders.

Let’s say you want to play the internal piano sound in combination with a string sound of an external sound expander, but the latter should only be triggered by keys higher than middle C. For that, you need to a) select the piano sound on the keyboard, b) select the string sound on the sound expander, and c) make the expander only respond to notes higher than middle C. Although this is a small example, it still can be tricky if your sound expander has a small display and tiny buttons. And when performing on stage, you definitely have to switch both devices to the right program before starting to play. Everything becomes more and more complex if you intend to use more sounds and if you want controllers like pitch bend or sustain to affect only a subset of the active sounds.

iMIDIPatchbay makes building such configurations a lot easier than it has ever been before.

What do I need to get started?

There is one thing you need besides your current gear (and besides an iPad if you don’t already have one): a CoreMIDI interface. There are some on the market, e.g. iRig MIDI or iConnectMIDI. The latter offers many ports so it really is predestined to be used with iMIDIPatchbay. However, by using the THRU ports of your keyboards/sound expanders or external MIDI splitters/mergers you may also be fine with a smaller interface – it depends on your application.

If you have a proper interface, connect your keyboards and sound expanders to the iOS device. Then, press the “Setup” button and set “Device” and “Channel” so that iMIDIPatchbay receives the data of you master keyboard. The “MIDI IN” LED in the main screen should flash now if you play on the keyboard.

Defining keyboard zones

The main purpose of iMIDIPatchbay is creating split and layer configurations for your sounds. For that, you can use up to three keyboard zones called “LO”, “UP” and “HI” which are divided by two split points (”LO Split Note” and “HI Split Note”). You define the number of zones by pressing the buttons “2” or “3”, and define the split points by holding “Set LO Split Note” or “Set HI Split Note” and then playing the desired note on the keyboard. Read further to learn how to use that zones for individual sounds.

MASTER and EXTERN sections

iMIDIPatchbay is divided into sections. There are four “EXTERN” sections which are used to send MIDI data to four sound sources. These can be on separate devices or in one multitimbral device, the only important thing is that each sound is listening on an individual MIDI channel or MIDI device.

The “MASTER” section is used to send MIDI data back to the master keyboard. Using this section usually only makes sense if the master keyboard is also a sound source, i.e. a normal keyboard with internal sounds.

Assigning sounds to keyboard zones

By default, each section is off. You turn it on by tapping the ON button. When the section is on, all notes which are played on the master keyboard are routed to the corresponding sound source. By holding the same button, you select the keyboard zones which are active for this section: You can either hold and wait while the app cycles through the zone selections, or hold and play a note within the zone(s) you want to be activated. It is also possible to select no zone.

Filtering out controllers

By default, all control changes which are coming from the master keyboard are routed to the sound source. However, you can easily filter out some of them by pressing the ON button and touching the desired controller, e.g. the pitch bend or the sustain pedal. You can reactivate it with another touch.

The supported controllers are sustain (CC64), after-touch, modulation wheel (CC1), pitch bend and expression pedal (CC11). All other controllers can be filtered out in the settings.

Sending controller values

Each “EXTERN” section has two parameter knobs and a parameter select button (“>”). With those you can control volume, pan, reverb and chorus of the sound source. Tip: Use two fingers to adjust the value more precisely.

By holding “>”, you can activate “Send on Load” which will make iMIDIPatchbay send the value of the selected parameter always when the current program is recalled.

With the octave shift buttons, you can transpose the sound in 12-half-tones steps.

Storing your configuration

After building your configuration, you can store it by pressing the “SAVE PROG” button which brings you to the store mode. Now, select the bank and program you want to store to, and press “SAVE PROG” again. If you press any other button instead, you cancel the store mode.

In the “SAVE PROG” button, there is an LED which flashes when the current program was modified. You can dismiss the changes by pressing the current program button again or by switching to another program.

You can configure iMIDIPatchbay so that it responds to program changes of the master keyboard or another app.

iMidiPatchbay is available for $54.99


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  • iPad Loops is a music app blog dedicated to exposing the best iPad apps for iOS musicians, producers, and Djs. This is not a database of every app. It is, however, one of useful recommendations from someone with many years in music production. I try to update it on a daily basis (ok sometimes every two days) and I do my best to post useful apps only. My name is Jason Donnelly (Dj Puzzle). You might know me from my royalty free loop packs and sound design. Some of the apps that contain my loops are Synth One, EG Segments, Hammerhead, Retronyms AudioCopy, LP-5, iPRO.DJSAMPLER, Looptastic. My work is published by Roland, Antares, Magix, Soundtrack Loops, Sample Logic, Acoustica, Loopmasters and many more. Subscribe to our RSS feed below to get updated when new apps are posted.
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