Midi Echo AU vs ab Phaser X
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Midi Echo AU
This app creates repeating MIDI note effects, similar to audio echoes but for digital music signals. It allows for independent control of note-on and note-off messages, offering extensive customization for musical expression.
- Selectable echo types (fixed, ping pong, taper)
- Adjustable number of echoes (0-20)
- MIDI velocity reduction for quieter echoes
- Define pitch interval for successive echoes
- Tempo sync or mSec delay time
- Set MIDI channel for echoes
- Disable individual echoes
- MIDI thru control
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AUv3 Midi Fx - Midi Echo online manual here: http:/amssoftware.org/manual/MidiEchoManual.pdf Note : AUv3 midi apps need a compatible host (AUM,Audiobus 3, Cubasis, BM3 etc). So what is a midi echo? It is similar to the audio echo effect where copies of the original audio are repeated at regular time intervals but with some form of change (e.g. quieter). But unlike audio, midi is digital in nature (low resolution 8 bit mostly) and focused around the midi note on & off message used to control synths etc. This app acts on midi note-on independently from the note-off but when the note – off appears it echoes the release of the note-on in the same way the note-on was echoed (pitch interval etc) even if the UI controls have changed. UI Controls exist to allow you to: * Select the type of echo (fixed, ping pong, taper) * Vary the number of echoes (from 0 to 20) * Make echoes quieter by reducing the midi velocity * Define the pitch interval (semitone) of all successive echoes * Select the delay time between echoes either tempo sync or in mSec * Define the delay type (fixed, tempo, random 50, random 20) * Set the midi channel of echoes (1-16) so that other synths can select the echo only * Disable individual echoes - to allow you to play chords with a small or 0 delay * Set Midi thru to keep/remove the original note messages * Panic button to quickly turn off all notes * Setup control automation as all controls are AU Parameters
ab Phaser X
This music app offers a versatile phase modulator with 2 to 12 stages. Customize sweeps with controls for rate, depth, frequency, and feedback. Adjust loudness and blend for your final sound.
- 2 to 12 stage phase modulation
- Rate control (DAW sync or 0.001Hz-10Hz)
- Depth, Frequency, and Feedback controls
- Gain and Mix controls for loudness and blend
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'ab Phaser X' is a phase modulator featuring from 2 to 12 stages. With 'ab Phaser X' you can control the rate of your phase, whether it's synced to your DAW's BPM or freely from 0,001Hz all the way to 10Hz. Depth, Frequency and Feedback controls help you customise your phase sweeps further and finally, a Gain and Mix control will allow you to control the loudness and the blend of the final Phaser.
Screenshots
Verdict
The clearest difference is rating: ab Phaser X at 5.0 against Midi Echo AU's 3.5. Midi Echo AU's advantage is update cadence (every 6 weeks vs every 11 months) and price ($1.99 vs $5.99). On ratings volume, ads, in-app purchases and monetization model 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
Midi Echo AU costs $1.99 and ab Phaser X $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.
ab Phaser X holds the better App Store score, 5.0 against 3.5. Both are backed by a comparable volume of ratings — 8 and 5 respectively.
Midi Echo AU ships an update every 6 weeks, ab Phaser X every 11 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.
| Parameter | Midi Echo AU | ab Phaser X |
|---|---|---|
| Price | $1.99 — better | $5.99 |
| Rating | 3.5 (8 ratings) | 5.0 (5 ratings) — better |
| Positive reviews | 50.0% of reviews | — |
| Number of ratings | 8 — better | 5 |
| Update frequency | Every 6 weeks — better | Every 11 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 11.0 — better | 12.0 |
| Further details — not scored | ||
| Size | 13 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | anthony saunders | Alejandro Cabrera Zuniga |
Customer experience
Midi Echo AU
ab Phaser X
In-app purchases
Midi Echo AU
No in-app purchases
ab Phaser X
No in-app purchases









