Midi vs Callback Freeverb
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Midi
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Seven MIDI controllers you'd actually want, in one app. MidiMorf is a suite of expressive iOS controllers with a deep 32-voice synth to play them through. Grab your phone, put on headphones, and you're jamming in ten seconds. Or connect the free companion server to your Mac and turn it into a wireless MIDI rig for Ableton, Logic, GarageBand, and any DAW that speaks MIDI. THE SEVEN CONTROLLERS • Morf-Pad — XY morphing pad with scale-locked notes • Strum-Chord — Omnichord-inspired chord grid + strum plate • Morf-Chord — 7 diatonic chord pads with per-chord XY voicing • Rose-Chord — Orchid-inspired: hold chord types, tap the keyboard • Dual M-Pad — two independent XY pads side-by-side • Transport — Play/Stop/Record + Mackie Control utility buttons • Morf-FX — XY effects pad with assignable FX buttons TWO WAYS TO PLAY Local mode — the built-in synth makes the sound. Headphones or a Bluetooth speaker. Never touch a computer. WiFi mode — run the free MidiMorf Server on your Mac. Every note, CC, and transport message flies over WiFi into your DAW. No cables, no MIDI interface, no latency headaches. THE SYNTH 32-voice polyphony. Dual oscillators (sine, triangle, saw, square) with PolyBLEP anti-aliasing plus a sub. Analog-modelled 4-pole ladder filter with resonance. Full ADSR on amp and filter. LFO. 4-slot modulation matrix routing accelerometer tilt, velocity, mod wheel, and LFO to filter, pitch, gain, and effect parameters. Distortion, tempo-friendly delay, reverb. MORE • Tilt your phone — the accelerometer is a live mod source • Custom color theme per controller • Favorite button — long-press to assign, tap to jump • Landscape-only, wood-frame Free. Made by Retro Relic. Get the Mac server at retro-relic.com/downloads.
Callback Freeverb
This app offers a classic algorithmic reverb effect based on the Freeverb algorithm. It adds depth, space, and atmosphere to audio sources, creating lush, spacious ambience. Designed for mono use, it provides a smooth, musical reverb tail suitable for vocals and synthesizers.
- Classic Freeverb algorithm
- Schroeder/Moorer reverb topology
- Comb and allpass filters
- Mono operation
- Adds depth and space to audio
- Smooth, musical reverb tail
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A classic algorithmic reverb effect based on the Freeverb algorithm by Jezar at Dreampoint. A Freeverb-style Schroeder/Moorer reverb based on the classic 8-comb + 4-allpass topology, with simplified controls and no stereo spread. This reverb creates lush, spacious ambience through a network of comb and allpass filters. Freeverb is widely used in electronic music production, ambient music, and sound design to add depth, space, and atmosphere to audio sources. The algorithm provides a smooth, musical reverb tail that works well on everything from vocals to synthesizers. This reverb only functions in mono and provides no stereo imaging, and the user can expect the same behavior as a classic Freeverb implementation otherwise.
Screenshots
Verdict
Midi and Callback Freeverb are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
| Parameter | Midi | Callback Freeverb |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Number of ratings | — | 1 — better |
| Update frequency | Every 2 months | — |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.5 | 17.0 — better |
| Further details — not scored | ||
| Size | 11 MB | 7 MB |
| Age rating | 4+ | 4+ |
| Developer | john Watson | Callback Audio, LLC |
In-app purchases
Midi
No in-app purchases
Callback Freeverb
No in-app purchases








