Comparison

Velocity Filter vs Lines

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • MIDI velocity to volume/filter conversion
  • MIDI-CC and aftertouch control
  • High-shelf filter modulation
  • Preserves original patch tone
  • Batch application to patches
Features
Read full description

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.

About

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.

Highlights
  • Creative signal mangling
  • Experimental synthesizer
  • Feedback-based sound design
  • Wide range of audio effects
  • Rhythm and soundscape generation
Features
Read full description

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

Velocity Filter4 screens
Lines1 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Velocity Filter costs $2.99 and Lines $19.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard2 real differences · 8 level
Velocity Filter versus Lines: the parameters behind the verdict, then further details
ParameterVelocity FilterLines
Price$2.99 — better$19.99
Rating5.0 (7 ratings)5.0 (11 ratings)
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings711 — better
Update frequencyEvery 3 weeks — betterEvery 13 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.012.0
Further details — not scored
Size15 MB29 MB
Age rating4+4+
DeveloperBlue Mangoo Consulting Company LimitedAudioThing Ltd.

Customer experience

Velocity Filter

All ratings7 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Lines

All ratings11 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews5 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Velocity Filter

No in-app purchases

None

Lines

No in-app purchases

Questions

Is Velocity Filter free?
Velocity Filter costs $2.99, with no in-app purchases.
Is Lines free?
Lines costs $19.99, with no in-app purchases.
Which has better reviews, Velocity Filter or Lines?
Velocity Filter and Lines are both rated 5.0 out of 5 on the App Store, from 7 and 11 ratings respectively.
Do Velocity Filter or Lines have ads?
Neither Velocity Filter nor Lines shows ads.
Which is updated more often, Velocity Filter or Lines?
Velocity Filter ships an update every 3 weeks, and Lines every 13 months. Most recently, Velocity Filter was updated on September 30, 2026 and Lines on October 15, 2026.

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