# Velocity Filter — Audio Unit Plugin

> Audio unit plugin for making synths respond musically to MIDI velocity. (iPhone/iPad app by Blue Mangoo Consulting Company Limited.)

- Source: https://appshunter.io/ios/app/velocity-filter/id1473094671 (this page in markdown: same URL + `.md`)
- Developer: [Blue Mangoo Consulting Company Limited](https://appshunter.io/developer/1475107602)
- Category: Music
- Price: $2.99
- Rating: 5.00/5 from 7 App Store ratings · 2 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.0 · 15 MB
- Languages: American English
- Released: 2019-07-24
- Data updated: 2026-08-30
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/velocity-filter/id1473094671/reviews.md

## What is Velocity Filter?

WHAT IS VELOCITY FILTER?

Velocity Filter is the fastest way to make all your synthesizer patches respond to MIDI velocity in a natural and musical way. Just add it to your audio unit effects on the synth track and you are done!


WHAT DOES IT DO?

It converts non-velocity-sensitive synths sounds into velocity-sensitive ones.

Velocity Filter can be configured as either a MIDI-controlled filter or a MIDI-operated volume control. In filter mode, it adds or removes high frequency energy according to the velocity of each MIDI note, so that lower velocity notes sound softer and have less high harmonic content. You can control the amount of boost or cut and the frequency range. In volume control mode, it adjusts the volume according to incoming MIDI velocity. 


WHAT ELSE DOES IT DO?

In addition to MIDI velocity, you can also control the filter using MIDI-CC or aftertouch controls. So you can control it in a variety of ways.


HOW IS THIS BETTER THAN EDITING MY SYNTH PATCHES TO MODULATE THE FILTER CUTOFF BY MIDI VELOCITY?

Most synthesizers respond to velocity either by modulating the cutoff frequency of a lowpass filter or by modulating the gain. Doing velocity response that way distorts the tone of the patch in an un-musical way, especially if it uses a resonant lowpass filter. Instead of modulating the gain of a lowpass filter, Velocity Filter modulates the gain of a high-shelf filter. The sound is very different, and can be applied on top of the existing filters in the synth patch without destroying the tone of the patch.

Also, if you are browsing through a collection of 1000 patches, it's much easier to apply this filter to the output than to modify each and every patch to modulate the filter cutoff with MIDI velocity.

However, it's not necessarily "better"; it's just very different. Read the limitations section below for why it's not always better.


WHAT LIMITATIONS DOES IT HAVE?

All notes go through one filter, so if you play two notes at the same time, with different velocities, it will set the filter for the loudest of the two notes.

Also, the filter takes about 1 millisecond to change from loud to soft, so if you quickly switch from loud to soft, you'll hear the filter clamping down AFTER the initial attack. This is problematic for synth patches that have near zero attack time.

Velocity Filter does not support GarageBand because GarageBand does not support sending MIDI messages to audio effects.

Velocity filter is an audio unit plugin ONLY. It runs inside of host apps such as AUM, Audiobus, Cubasis, Auria, and Beatmaker 3.

## Key features

- MIDI velocity to volume/filter conversion
- MIDI-CC and aftertouch control
- High-shelf filter modulation
- Preserves original patch tone
- Batch application to patches

## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/velocity-filter/id1473094671/reviews.md

### 5/5 — Not gonna listen to a single word

*2024-10-20*

This is the most elegant sophisticated most aesthetically appealing and pleasing piece of art From this developer!

Point 1. Literally never come across a single similar piece of app like this.

Are you the God?

### 5/5 — Phfffffresh!

*2019-08-02*

This sounds totally different from the lowpass filters in my synths, in a good way and it’s very easy to use. 

They did a nice job of setting the range limits of the controls so that you can get a variety of tones out of it but you can’t dial in any sounds that are so extreme that they wouldn’t be musically useful. So it sounds good regardless of where you set the filter cutoff and the upper and lower gain limits. Adjusting it is just a question of deciding which flavour of “good” you want to hear today.

## Frequently asked questions about Velocity Filter

### What is Velocity Filter?

Velocity Filter is an audio unit plugin designed to make synthesizer patches respond dynamically to MIDI velocity. It converts non-velocity-sensitive sounds into velocity-sensitive ones, acting as either a MIDI-controlled filter or volume control.

### How does Velocity Filter improve synth sounds?

Instead of distorting the tone by modulating gain, Velocity Filter uses a high-shelf filter. This allows lower velocity notes to sound softer with less high harmonic content, creating a more natural and musical response without compromising the original patch's tone.

### Can Velocity Filter be controlled by more than just MIDI velocity?

Yes, in addition to MIDI velocity, Velocity Filter can also be controlled using MIDI-CC or aftertouch signals, offering flexible modulation options for your synthesizer patches.

### What are the limitations of Velocity Filter?

Velocity Filter processes all notes through a single filter, meaning simultaneous notes with different velocities will be affected by the loudest. It also has a slight delay (approx. 1ms) in transitioning from loud to soft, which can be problematic for synth patches with very fast attack times.

### Does Velocity Filter work with GarageBand?

No, Velocity Filter does not support GarageBand because GarageBand does not allow MIDI messages to be sent to audio effects plugins.

### What hosts can I use Velocity Filter with?

Velocity Filter is an audio unit plugin that runs inside compatible host applications such as AUM, Audiobus, Cubasis, Auria, and Beatmaker 3.

### How much does Velocity Filter cost?

Velocity Filter is a paid application, priced at $2.99. There are no in-app purchases or subscription fees associated with its use.

### How often is Velocity Filter updated?

Velocity Filter was last updated on November 17, 2020, to version 1.0.5. It was initially released on July 24, 2019.

## Version history (last 5 releases)

### 1.0.6 — 2026-07-30

Smaller fixes and improvements.

### 1.0.5 — 2020-11-17

1. Fix crash bugs on IOS 14
2. Fix parameters are not being loaded correctly in AUM.

### 1.0.4 — 2020-10-13

Saving Custom User Presets on iOS14.0

### 1.0.3 — 2020-10-05

Shared data between au3 hosts.

### 1.0.2 — 2019-07-29

1. Update main app UI.
2. Add "Filter transition speed" slider.
3. Add Latency compensation mode.

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All apps by Blue Mangoo Consulting Company Limited: https://appshunter.io/developer/1475107602

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-30.*