FuncBud Math Sequencer & Synth3.1

FuncBud is an AUv3 MIDI sequencer app that generates sequences using simple math functions. You can create math functions with the function builder, then chain and repeat them to create complex sequences.

A simple x + 1 function would sequence all the notes in the scale in order. It gets more interesting when you use different formulas and chain them.

The sequencer starts from the root note and evaluates the first formula to calculate the new note. Then, it moves to the next formula. If it's a repeating function, it repeats the specified number of times before moving to the next formula. The formula's result is converted to a note in the working key and scale, within the defined minimum and maximum octaves. This new note is then played. Additionally, the result is stored in a history of up to 64 entries for later sum or product calculations

The function builder lets you create functions with simple addition, subtraction, multiplication and division operations as well as square, square root, sum and product operations. You can also use parentheses to prioritize the calculation order. The newly created function will be saved and accessible in the library across both the standalone app and AUv3 instances.

With the conditional functions, you can specify a condition like "if this function is greater than that function, then execute the function A, otherwise execute the function B".
The random function generator will generate a value between two functions, a function for the lower bound and another function for the upper bound.

The sequencer picks the notes in the current key and scale, between the minimum and maximum octaves. You also have a root note, the starting note, which are all defined at the top of the UI. You can use BrainBud to change the key and scale as well.

The sequencer speed (rate), gate length, gate length variety, velocity, velocity variety and swing parameters are accessible with the sliders at the bottom of the UI.

In edit mode, you can change the order of the functions. You can also delete a function in edit mode, or simply by swiping it to the left.

Newly created patterns automatically copy the current one, making subtle changes easier. If you prefer a clean slate, you can quickly clear the list with the clear button.

The loop detection function is accessible in the settings menu. When enabled, it would detect the loop and increment the 'x' value by 1 to break the loop.

Please note that FuncBud is a MIDI app. The standalone version has an optional internal synth where you can enable or disable on the settings menu. The AUv3 plugin requires an audio app for output. For the AUv3 functionality, it needs to be hosted within an app such as AUM, Loopy Pro, Cubasis, Logic Pro, Nanostudio, Drambo, or apeMatrix.

Version History This version fixes the AUv3 state saving issue on iOS 26.7 3.1 Sep 25 This version
- Updates the audio engine
- Increases the AUv3 dsp performance
- Fixes the visual bugs
- Fixes the previous backwards compatibility issue 3.0 Sep 20 This version
- Adds factory presets to the library and the AUv3 plugin
- Adds online user manual to the settings menu
- Adds built-in sampler to the standalone app
- Updates and improves the audio engine
- Updates the sequencer performance 2.5 Jul 27 This version updates the support section on the settings menu. 2.4 09/02/2024 This version
- Adds filter cutoff key tracking to the internal synth.
- Updates the support section of the settings menu.
- Disables the note filtering for the notes exceeding the max octave depending on the key and scale. 2.3 08/01/2024 This version adds iCloud support for the presets.
- The presets will be saved to the iCloud under the FuncBud folder
- They can be shared between multiple iOS and Apple Silicon devices.
- They can be shared between the standalone app and AUv3 plugin.
- Your older presets will be saved to iCloud automatically once you create a new preset with the new version. 2.2 07/24/2024 This version
- Fixes the issue on favoriting a formula on the library.
- Updates key and scale picker.
- The scale picker won't close when you pick a scale.
- You can select and audition a scale when you select one.
- The scale picker will close when you press the done button on the top right.
- You can select and audition a key and an accidental.
- The key picker will close when you press the done button on the top right. 2.1 07/16/2024 This version adds the new preset manager to the standalone app and AUv3 plugin.
- Open the library and navigate to the "Presets" from the tab bar menu at the bottom of the screen.
- Save the current state as a preset by pressing the add button on the top right.
- Select a preset from the list to load the preset.
- Updates the internal synth on the standalone app.
- The internal synth has a more analog character with the new sub oscillator. 2.0 07/08/2024 This version lets you change the root note with MIDI.
- Enable it on the settings menu under the Transposition section.
- Assign a MIDI channel and send notes to that MIDI channel.
- If the note is in the scale, it will change the root note.
- If the note is in the scale but not in the min/max octave bounds, it will change the root note in the closest octave.

Previous version adds conditional functions and random generator functions.
- Create a conditional function on the function builder by selecting the conditional button.
- Enter an if condition function, condition, then and else functions.
- If the conditions are met, the "then" function will be executed.
- Otherwise, the "else" function will be executed.
- Create a random generator function on the function builder by selecting the random button.
- Enter a minimum value or function, and enter a maximum value or function.
- It will generate a random value between the min-max values.
- The stepper control UI has been updated on the main screen.
- Minor UI fixes and improvements. 1.9 07/06/2024 This version adds conditional functions and random generator functions.
- Create a conditional function on the function builder by selecting the conditional button.
- Enter an if condition function, condition, then and else functions.
- If the conditions are met, the "then" function will be executed.
- Otherwise, the "else" function will be executed.
- Create a random generator function on the function builder by selecting the random button.
- Enter a minimum value or function, and enter a maximum value or function.
- It will generate a random value between the min-max values.
- The stepper control UI has been updated on the main screen. 
- Minor UI fixes and improvements. 1.8 07/05/2024 This version adds an internal synth to the standalone app. 
- You may enable/disable the internal synth from the settings menu.
- The loop detector has improved and it automatically detects the loops without asking you the looping notes count.
- The looping note count input has been removed from the settings menu. 1.7 07/01/2024 This version fixes a UI bug on the knob controls. 1.6 06/25/2024 Fixed a bug when a copied pattern sharing the functions mute state with the original pattern.
Performance improvements. 1.5 06/15/2024 Minor fixes and improvements. 1.4 06/10/2024 This version adds the option to use the velocity of the MIDI trigger instead of the internal velocity, when the manual trigger mode is active.
Filters the notes exceeding the maximum octave range.
Fixes and updates minor UI bugs. 1.3 06/10/2024 This version adds manual trigger and transpose with MIDI.
- Enable the transpose with MIDI on the settings menu,
- Set a MIDI channel,
- When it receives a MIDI note, it will change the key.

- Enabled the manual trigger mode on the settings menu,
- Set a MIDI channel
- When it receives a MIDI note, it will advance the sequencer.
- You can also enable the hold-note mode if you don't want to use the sequencer's internal gate and rate settings.
- It will play and hold the note as long as it receive a MIDI note when hold-note mode is enabled. 1.2 06/09/2024 Fixes the UI bug happening after reordering the functions while the sequencer is playing. 1.1 06/06/2024 1.0 06/06/2024