# 7XDXFM 4OP FM Loop Maker — FM Synthesizer & Sequencer

> FM synthesizer and 7-track sequencer with Ableton Link and audio export. (iPhone/iPad app by Rob Wilmot.)

- Source: https://appshunter.io/ios/app/7xdxfm-4op-fm-loop-maker/id1589435250 (this page in markdown: same URL + `.md`)
- Developer: [Rob Wilmot](https://appshunter.io/developer/520672432)
- Category: Music, Productivity
- Price: $2.99
- Rating: 4.00/5 from 6 App Store ratings · 4 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.6 · 14 MB
- Languages: American English
- Released: 2022-06-10
- Data updated: 2026-09-04
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/7xdxfm-4op-fm-loop-maker/id1589435250/reviews.md

## What is 7XDXFM 4OP FM Loop Maker?

Welcome to 7XFM - a 4 operator FM synthesizer and 7 track sequencer with Ableton link, recording, and routing for your audio to connect to AUM or Audiobus.
With most of the important synthesizer settings found in most FM synthesizers and added modulation.
Modulate the operators over time with the LFO, plus dynamics for amplitude and pitch of modulators wherever you add an ACCENT
Pick from a range of preset frequencies for carrier and modulators (influenced by Orla DSE/Bohm FM Expander synthesisers)
Create those classic FM sounds from punchy Lately Bass to smooth 80s fm pads or crazy chaotic FM sound effects.
Keep in Sync with your apps using Ableton Link or MIDI
Send MIDI clock or MIDI note as separate channels.
This app was influenced by the Korg Volca/Electribe FM synth sequencers as well as TX81z and Orla DSE9 FM synthesizer

SEQUENCER
The sequencer has 7 channels containing a sequence dedicated to a tone sound.
You can create sequences using step edit or bring up the PIANO ROLL for quick step placement.
You can just randomly generate steps - either random choice pitches or SELECT NOTES. or shuffle the sequence

PIANO ROLL!
its easy to create melodies and bass lines fast!
Double click step to cycle though octaves or erase across step with finger motion.
Mask keys so you can define keys and swipe across bar with finger motion to lay down steps easily.

EFFECTS! 
Each track has echo, reverb and a low pass filter similar to add some spacial atmosphere or emulate an analogue synthesizer.

COOL CREATIVE FEATURES!
2nd and 3rd voice generators with detune and transpose by semitomes for fat chorus effects or chorded notes
Auto level ducking switchable input from bass metronome or any track
Playback timing of notes on sequences - steps triggered either at 4th or 8th timings - a sequence can play slower and last longer equivalent to 512 steps
Added a “mutate tone” option that slowly modifies the sound randomly away from original.
Added “randomise tone” that completely creates a random tone from fresh.

GLOBAL TRANSPOSE!
All channels can be transposed simultaneously on the fly to create great layered melodies, and you can choose which ones are ignored (TR LOCK) for things like sound effects.

SONG MODE is like a playlist of programs, where you can chain programs from either the current loaded program or imported saved program file. A scene can have any track muted, global transposed, reset counter at start (D.C.) "Da Capo", override step length and control the BEAT ON metronome mode.
You can then arm sampling and record the chained programs and export the audio. Save your Songs and they won't be affected by changes in the original programs.
EXPORT!
You can easily record a perfect loop of whatever is playing and export via AudioCopy or Audioshare as well as email and IOS Folder
Export your tones, sequences or whole programs to another device, friend or saved elsewhere

SYNC
This is compatible with Ableton Link as well as MIDI so you have options for connecting to external hardware or other apps while keeping in  time

AUDIO ROUTING
Output the main audio to other apps such as Audiobus or AUM to allow those apps to record or process your creations

EXTERNAL CONTROL
Control Mute of tracks with midi keys, volume of track-channel with MIDI CC 176 for channel 1, , 177 - channel 2 etc .. 
MIDI note input of one track's sound available while sequencer is playing all tracks - selectable tracks controlled by all midi channels (omni) THIS DOESNT ACCEPT MULTIPLE MIDI PER SEQUENCE.

## Key features

- 4 operator FM synthesizer
- 7-track sequencer
- LFO modulation
- Piano roll editing
- Echo and reverb effects
- Ableton Link and MIDI sync
- Audio export

## Recent user reviews (4 of 4)

All indexed reviews: https://appshunter.io/ios/app/7xdxfm-4op-fm-loop-maker/id1589435250/reviews.md

### 4/5 — 💚💚💚💚

*2025-08-20*

love all these yet its really missing randomizers for instruments and etc parameter randomize would complete these apps!

### 5/5 — Excellent app, why have I not heard of it before?

*2024-03-26*

Bought all 5 of your apps in the package. Like what I see so far, simple to use, great results. Nice work. Some sort of parameter lock in this app and step probability in all apps would be the icing on the cake.

### 3/5 — Non legible small font unnecessarily

*2024-03-24*

On an iPhone the fonts are stupid small for no reason. It amazes me! It’s like they don’t even look at their own product. Why do you make it so hard to read?! Fair sound that can be very strange but with an old fashion late 1980s UI. Weird animal.

**Developer response:** Apologies. Hopefully the update has helped.

### 3/5 — Ambitious mess

*2022-06-11*

Disclaimer: I’m on an iPad Pro, and I own this developer’s other apps, so I knew the UI can be a little challenging, but this one is more of a struggle. 
* Main issue is the sound engine tends to lag behind the user input and control, leading to a frustrating play experience. A groovebox that’s hard to groove with. 
* Feature request: Add ways to randomize the sound setting, ratios, and patterns will lead to more happy accidents and faster workflow.
* There only seems to be four selectable algorithms unless I’m missing something, which is little disappointing. 
* The sample looper seems out of place and difficult to use.
Maybe with some updates, performance improvement, and polish this could be fun.

**Developer response:** Hi thanks for feedback. Could you email any feature requests as I don’t always see all comments on reviews.
 I’m already looking at a nice new extra feature right now. Always good to hear of feature requests though and will look at those.
Ps there are 5 algorithms. The fifth one allows each operator to be a carrier (4 separate audible oscillators) while two of these still get to modulated themselves . This is common to be included in most FM synthesisers

## Frequently asked questions about 7XDXFM 4OP FM Loop Maker

### What is 7XDXFM 4OP FM Loop Maker?

7XDXFM 4OP FM Loop Maker is a music creation application featuring a 4-operator FM synthesizer and a 7-track sequencer. It allows users to craft complex FM sounds and arrange them into sequences, with advanced modulation and effects.

### What are the key sound design features of 7XDXFM 4OP FM Loop Maker?

It offers a 4-operator FM synthesis engine with adjustable carrier and modulator frequencies, LFO modulation for operators, and dynamics for amplitude and pitch. Users can create a wide range of FM sounds, from basses to pads and sound effects.

### How does the sequencer in 7XDXFM 4OP FM Loop Maker work?

The sequencer has 7 channels, each dedicated to a tone sound. It supports step editing, a piano roll for quick note placement, and random generation or shuffling of steps. Sequences can be played at different timings and lengths.

### Can 7XDXFM 4OP FM Loop Maker sync with other music apps?

Yes, it is compatible with Ableton Link and MIDI, allowing synchronization with other apps and hardware. It can send MIDI clock or MIDI notes on separate channels.

### What export options are available in 7XDXFM 4OP FM Loop Maker?

You can record and export loops via AudioCopy or Audioshare, as well as email and iOS Folders. It's also possible to export tones, sequences, or entire programs to other devices or for backup.

### Does 7XDXFM 4OP FM Loop Maker have ads?

No, 7XDXFM 4OP FM Loop Maker does not contain advertisements. It is a paid application, and users can enjoy an ad-free experience.

### What devices is 7XDXFM 4OP FM Loop Maker compatible with?

This application is compatible with iPhone, iPad, and iPod touch devices. It is designed for Apple's iOS ecosystem.

### How often is 7XDXFM 4OP FM Loop Maker updated?

The latest version, 2.1, was released on May 30, 2025. While specific update frequency isn't detailed, the developer has provided updates, indicating ongoing support for the application.

## Version history (last 5 releases)

### 2.1 — 2025-05-30

Updated UI
Removed Randomise as this was not very helpful.
Improved mutate so it replaces the old of randomisation. Start off with a tone , copy it as backup, then press mutate a few times. Then paste and try again. Better results this way.

### 2 — 2025-05-28

Updated core code and bug fixes
Better loop length and Audiobus connections (open  the app first)

### 1.31 — 2022-09-09

Added double tapping on a part in song mode, so before it starts, makes it start on that part first. Useful if you want to test out single part looping itself and you dont have to wait for first part to finish.
Double tapping used to just force the next part after the first part was played.

### 1.3 — 2022-09-06

Added Song Mode to automate mute on each track, global  transpose, beat metronome and step length adjustment , counter reset etc to automate a composition with current program or import/insert saved programs in together.
Some bug fixes and UI changes

### 1.21 — 2022-07-02

Minor bug fixes - see at bottom:
Added features are as follows:
Second and third voice unison generators with semitones and subtle detune for fatter sounds or chords
Auto level ducking switchable track input from bass metronome or any track
Pan moved to mixer section
Added value readout on to each dial so you can see their current level 
Added Preview switch to allow previewing sound when selecting channel. This was originally always off when sequencer was running.
Playback timing of notes on each track sequences - steps triggered either at 4th or 8th timings ( doesn’t change envelope times ). Useful for slower, longer sequencers - equivalent of 512 steps length with 64 steps used .
Moved copy /paste tone to sound section (didn’t feel right in files section )
Fixed some playback issues of metronome beat, missing 1st step
Added a “mutate tone” option that slowly modifies the sound randomly away from original.
Added “randomise tone” that completely creates a random tone from fresh.
Added MIDI NOTE input to play one of the track sounds, selectable track in settings/midi
Added MIDI track mute control of each track plus cycle metronome beat modes using midi keys 1-7,  octave 1
Added MIDI volume control on each track. This uses CC176…183, code 7
Modified gfx a bit
New factory preset sounds

BUG FIXES
-  fixed an audio glitch with import button bringing up window
- Removed three  corrupt factory sounds (TheUpsideDown, Sound, and ToBoldlyGo)
- Issue with new features not being updated with old settings from older versions saves (tones)

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All apps by Rob Wilmot: https://appshunter.io/developer/520672432

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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 2026-09-04.*