Velocity Filter vs Lines
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Velocity Filter
This audio unit plugin enhances synthesizer patches by making them responsive to MIDI velocity. It can function as a MIDI-controlled filter or volume control, adding natural musicality to non-velocity-sensitive sounds without altering their core tone.
- MIDI velocity to volume/filter conversion
- MIDI-CC and aftertouch control
- High-shelf filter modulation
- Preserves original patch tone
- Batch application to patches
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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.
Lines
This audio effect plugin transforms any signal into a wide spectrum of sounds, from lo-fi to distortion and feedback. It can also function as an experimental synthesizer, creating rhythms and soundscapes even without input.
- Creative signal mangling
- Experimental synthesizer
- Feedback-based sound design
- Wide range of audio effects
- Rhythm and soundscape generation
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Lines is an effect plugin that crosses borders: it can be used as a creative mangler of all kinds of signals, ranging from lo-fi telephone sounds, lush phasing, warm distortions, crushing feedback, ring modulation and unique frequency shifting. But even without any input, it can be an experimental synthesizer based on feedback, allowing for a wide range of inspiring rhythms, pulses, and organic soundscapes. If you combine input and internal engines an unheard spectrum of sounds appears.
Screenshots
Verdict
The clearest difference is price: Velocity Filter at $2.99 against Lines's $19.99. Velocity Filter also leads on update cadence (every 3 weeks vs every 13 months). On rating, review sentiment, ratings volume and ads there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Velocity Filter costs $2.99 and Lines $19.99 up front. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 5.0 for Velocity Filter against 5.0 for Lines. Both are backed by a comparable volume of ratings — 7 and 11 respectively. Written reviews split almost evenly too, at 100% and 100% positive.
Velocity Filter ships an update every 3 weeks, Lines every 13 months. The most recent releases landed on September 30, 2026 and October 15, 2026 respectively.
| Parameter | Velocity Filter | Lines |
|---|---|---|
| Price | $2.99 — better | $19.99 |
| Rating | 5.0 (7 ratings) | 5.0 (11 ratings) |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 7 | 11 — better |
| Update frequency | Every 3 weeks — better | Every 13 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 | 12.0 |
| Further details — not scored | ||
| Size | 15 MB | 29 MB |
| Age rating | 4+ | 4+ |
| Developer | Blue Mangoo Consulting Company Limited | AudioThing Ltd. |
Customer experience
Velocity Filter
Lines
In-app purchases
Velocity Filter
No in-app purchases
Lines
No in-app purchases









