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Midiflow Limiter (Audiobus)

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App Store Description:

This MIDI effect app for Audiobus 3 is a filter and remapper for note velocities. Filter out notes that are too loud or too quiet, or remap them to different values. Use multiple instances to create velocity layers, which trigger different sounds based on the notes' velocity.

+ Specify a velocity range to filter out notes
+ Use a curve to remap velocities
+ Remap to a fixed velocity
+ Use multiple instances of this effect in Audiobus

NOTE: This app requires Audiobus 3. Insert it into one or more MIDI effect ports to affect the data going through the respective pipelines.

The range selector at the top allows you to specify the velocity of notes that can pass. All notes with velocities outside of that range will be filtered out. You can see in real-time what note velocities are coming in, so adjusting the range according to notes you play on a keyboard or generate with a sequencer is very easy.

Midiflow Limiter can be added multiple times to an Audiobus configuration. If you are using an external keyboard, you can build velocity layers. Just create two routes in Audiobus with the keyboard as a source and two synths as destinations. Then add Midiflow Limiter as an effect in both routes. You can then apply different velocity ranges for both synths, and only notes with a matching velocity will trigger their sounds.

The velocities of notes that have not been filtered out in the previous step can be remapped with a so-called velocity curve. The horizontal axis represents all possible values for incoming velocities. The curve determines the remapping function used to modify the velocities. Use the four handles to adjust the curve.

Velocity remapping has various applications. You can make a piano sound a lot "stronger" with a curve like above, as louder notes are triggered "earlier" in terms of force applied to the keys. A curve with the bow to the other side makes it "softer". Other curves can increase or reduce the range of velocities.

If you want to get rid of the velocity information in the notes, you can remap them to one fixed value. This corresponds to a curve that looks like a horizontal line.

Midiflow Monitor (Audiobus)

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App Store Description:

Do you want to see what MIDI is doing in your Audiobus setup? Just add Midiflow Monitor into one or more MIDI effect ports and the app will print what is going through. This can help you find problems or just understand how MIDI works. This app is a must-have and available for free.

+ Track MIDI commands when the app is in the foreground or background
+ Use multiple instances of this effect in Audiobus
+ Use Split View/Slide Over to display the monitor next to other apps

NOTE: This app requires Audiobus 3. Insert it into one or more MIDI effect ports to monitor the data going through the respective pipelines.

Midiflow Splitter (Audiobus)

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App Store Description:

If you play your synth apps with an external keyboard, Midiflow Splitter is an essential tool for you. This MIDI effect app for Audiobus 3 lets you create split and layer configurations in an easy but powerful way. Thanks to Audiobus State Saving, everything can be saved and recalled when your show is about to start.

+ Add any number of split points
+ Assign resulting key zones to synth apps
+ Transpose each synth app in octaves
+ Choose which controllers (sustain, pitch-bend, etc.) should be active for each synth app
+ Solo sounds
+ Supports multiple keyboards

NOTE: This app requires Audiobus 3. Create at least two MIDI pipelines with your keyboard as input and different synth apps as output. Then insert this app into the effect ports.

Midiflow Splitter shows all synth apps as rows above the input keyboard. For each synth, you can select in which zone it should be active. The zones of the keyboard are defined by split points. Move, add, or remove split points to adjust the zones. If you are using multiple keyboards, they will show up with independent split point selectors.

An octave shift can be applied to each synth in your configuration. This is useful if you have assigned a sound to a zone on the lower part of the keyboard, but still want to trigger high notes. Just shift the notes by a couple of octaves, and you're done. You can also activate or deactivate controllers like sustain or pitch-bend for each synth app individually. That way, your controllers only affect the sounds you really want to manipulate, and keep the others unchanged.

After you have set up your split and layer configuration, you might need to tweak a synth's sound again. By activating "solo", all other synth apps will be deactivated so that you have the whole keyboard for this one sound. This is very handy if you have arranged the sound in a layer and quickly want to mute the other sounds for a moment.

Midiflow Scales (Audiobus)

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App Store Description:

This MIDI effect app for Audiobus 3 lets you filter out unwanted notes or remap them to a scale. Thin out tracks from a sequencer to create a reduced variation. Prevent wrong notes when playing on a keyboard. Generate harmonies by using the app in combination with Midiflow Transposer.

+ Filter out "wrong" notes that are outside of a scale
+ Remap notes to the closest "right" note
+ Play a scale using the white keys (or all keys)
+ Pick notes manually
+ Select from a list of predefined scales (Min/Maj Blue, Ionian, Dorian, ...)
+ Use multiple instances of this effect in Audiobus

NOTE: This app requires Audiobus 3. Insert it into one or more MIDI effect ports to affect the data going through the respective pipelines.

In music theory, a scale is basically a set of tones relative to a root note. Building chords and melodies from a scale identifies its unique sound. The most popular scale might be the ionian scale in C, which is made up of all white keys on the keyboard. The scale of all black and white keys is called the chromatic scale.

Midiflow Scales is a note filter and remapper that is optimized for working with scales. The keyboard-style note selector lets you activate notes that should pass the filter and deactivate those that should not go through. You can also select from the list of pre-defined scales.

If you select a different root note (default is C), the app will update the selected keys to maintain the scale. So, if you have selected the ionian scale in C, and then change the root note to G, you'll see the F changing to an F#.

Midiflow Scales can not only mute "wrong" notes, which are notes outside of the scale, but it can also move those notes inside. The selector at the bottom lets you choose between filtering out those notes or remapping them to the nearest note that is part of the scale. If possible, the algorithm assigns the activated notes to the keys of the ionian scale. What sounds complicated actually makes it very easy for you to play different scales just with the white keys, or transform a stream of notes into a completely different scale.

While the previous remapping methods ("Nearest" and "Filter out") correct incoming data to match a scale, Midiflow Scales can also reorder the notes on the keyboard, so that you can play the scale without thinking about its half tone/full tone steps and the root note: With the "White keys" option, all notes of the scale will be assigned to successive white keys. For example, if you want to play "Min Blue" in E, you then just have to play C, D, E, F, G, A on the keyboard. The option "Chromatic" does the same but with C, C#, D, D#, etc.

This note remapper has many applications and is really fun to use. If you have a melody programmed in a sequencer, you can create a bass line by sending the same track through this app and activate only one tone. Experiment with the remapping options explained above to either get bass notes on every melody note, or only when the melody reaches the root note.

Thin out tracks by removing some tones to create variations. Or use this simplified version of the track in parallel for a second, layered sound. This is also very useful when playing live with multiple sounds.

Audiobus allows you to chain MIDI effects, and doing so with Midiflow Transposer and Midiflow Scales lets you create second voices: First transpose the notes by 4 half-tones and then force them to the ionian scale, for example.

Midiflow Keyboard (Audiobus)

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App Store Description:

This keyboard for Audiobus 3 allows you to perform music with multiple synth apps at the same time. Use the piano or scale layout to play single notes, and select the chord keyboard for accompaniments. With Audiobus 3, it's super simple to connect the keyboard to your synth apps.

+ Piano layout
+ Scale layouts (Min/Maj Blue, Ionian, Dorian, ...)
+ Chord layout
+ 2 independent keyboard strips on the iPad, 3 on the iPad Pro
+ Quickly switch sounds
+ Adjust visible key range and
+ Jump to other octaves using up/down buttons
+ Transpose output in half-tone steps
+ Modulation wheel
+ Pitch-Bend wheel
+ "Hold" mode with unisono option
+ Note velocity can be controlled via position or acceleration of the touch, or set to a fixed value
+ Use Split View/Slide Over to display the keyboard next to other apps

NOTE: This app requires Audiobus 3. Insert it into one or more MIDI sender ports to control the synth apps in the MIDI output ports of the respective pipelines.

Midiflow Keyboard is probably the most essential MIDI companion app for Audiobus. It allows you to trigger your synth apps with sophisticated layouts for single notes or chords. With its two keyboards, you can even perform with multiple sounds simultaneously.

The streamlined user interface shows the most important controls on the main screen. Quickly change the visible key range in octave steps – you can even keep holding down keys while doing so. Switch on "hold" and keys will stay pressed until you hit them again. Or activate "unisono" and only one note will sound. And, of course, there are pitch-bend and modulation wheels for effects.

It's not only about which notes you play, but how you play them. By default, you play louder notes by hitting them further down the length of the key. You can also make the app interpret the actual velocity of your taps by using the accelerometer. However, if all you want is a fixed velocity on each tap, that is possible, too.

Choose from a list of different keyboard styles that match your playing style best. The regular piano layout is just the beginning. You can select from a list of scale layouts to explore their different sounds and play solos without ever hitting a wrong note. Screen space is valuable – hide the pitch-bend and/or modulation wheel if you don't need them, making more space for keys.

Since it can be quite tricky to play chords on a touch screen, this app comes with a unique chord keyboard. The lower row triggers root notes, while the upper rows trigger chords. This layout makes it very easy to play chord accompaniments with index and middle finger that would require two full hands on a real piano.

The port selector in the upper right corner allows you to specify, for each keyboard, which sound to trigger. You can even select multiple destinations to layer the sounds. In order to reflect the active sound, the color scheme of the keyboard will adjust to match the app's icon.

Midiflow Keyboard works great in Split View and Slide Over, the two multitasking modes in iOS. Just swipe from the right screen side and launch the keyboard. That way, you can trigger nodes while making adjustments in an effect app or Audiobus itself. In order to take full advantage of the screen space, the keyboard is rotated 90 degrees. You can either use the right hand to play it while using the left hand in the main app, or simply rotate the device to use both hands for the keys.
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