7XDXFM 4OP FM Loop Maker vs NoteBridge
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
7XDXFM 4OP FM Loop Maker
Create complex FM synthesizer sounds and sequences with this 7-track music production tool. Features include LFO modulation, piano roll editing, and built-in effects like echo and reverb. Sync with other apps via Ableton Link or MIDI, and export your creations.
- 4 operator FM synthesizer
- 7-track sequencer
- LFO modulation
- Piano roll editing
- Echo and reverb effects
- Ableton Link and MIDI sync
- Audio export
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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.
NoteBridge
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Your sequencer sends one set of notes, your instrument expects another. NoteBridge sits between them in AUM and remaps notes, channels and controllers (CCs), which also makes it handy for pointing drum pads at a drum app's voices. Each row maps an incoming channel and note to an outgoing channel and note. Tap the ear and play a pad on your hardware to fill in the input, or add a row and set the numbers yourself. Drag a number up or down to change it, or tap it to type. Show notes as numbers or as names with octaves. Knob rows do the same for controllers. Take the CC a hardware knob sends and pass it on as another CC, on another channel if you like, through a curve you draw. Put several rows on one knob and it moves several parameters at once, each with its own curve. • Learn: tap, play a note or turn a knob, done • New rows keep the spacing of the last one, so a kit maps in a few taps • CC mapping with a curve editor: straight or smooth lines, points that snap to 25, 50, 75 and 100, invert, and copy and paste between rows • Notes no row maps pass through or are blocked, your choice • Set the input or output channel of every row at once • Panic ends every sounding note; notes held while you edit still end where they started • Undo, swipe to delete, drag to reorder • 32 built-in presets, plus your own: save them, share them by Mail or AirDrop, and import ones others send you • Map Pass/Block, Panic and mapping on/off to hardware controls in the host • Everything no row takes passes through untouched Name presets "Source → Target" so others know what they map. Send a good one to the developer from the preset menu and it may ship as a built-in preset.
Screenshots
Verdict
The clearest difference is price: 7XDXFM 4OP FM Loop Maker at $1.99 against NoteBridge's $3.99. 7XDXFM 4OP FM Loop Maker also leads on iOS requirement (15.6 vs 17.0). On update cadence, ads, in-app purchases and device support 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
7XDXFM 4OP FM Loop Maker costs $1.99 and NoteBridge $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.
7XDXFM 4OP FM Loop Maker ships an update every 5 days, NoteBridge every 6 days. The most recent releases landed on October 27, 2026 and October 29, 2026 respectively.
| Parameter | 7XDXFM 4OP FM Loop Maker | NoteBridge |
|---|---|---|
| Price | $1.99 — better | $3.99 |
| Rating | 4.0 (6 ratings) — better | — |
| Positive reviews | 50.0% of reviews | — |
| Number of ratings | 6 — better | — |
| Update frequency | Every 5 days — better | Every 6 days |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.6 — better | 17.0 |
| Further details — not scored | ||
| Size | 14 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Rob Wilmot | Tanel Teemusk |
In-app purchases
7XDXFM 4OP FM Loop Maker
No in-app purchases
NoteBridge
No in-app purchases





