Transfer Function vs LM AUDIO
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Transfer Function
This app performs dual-FFT acoustic analysis for sound systems, including music. It offers magnitude, phase, and coherence graphs, a delay finder, and a signal generator. It can operate with internal microphones or external audio interfaces for comprehensive sound system monitoring and equalization.
- Dual-FFT acoustic analysis
- Magnitude, Phase, Coherence graphs
- Delay Finder
- Signal Generator
- Music as signal source
- Internal microphone support
- Two-channel audio interface compatibility
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Transfer Function is a dual-FFT acoustic analysis app that is used for sound system audio analysis. Since it can operate with music as the signal source, it can be used during a musical performance to monitor and turn the system equalization during the show. Transfer function includes: -- Magnitude Graph -- Phase Graph -- Coherence Plot -- Delay Finder -- Signal Generator Normally a transfer function requires a two-channel interface, and that is true with this one, also, if you want to use it with program material (music). However, you can use our Transfer Funciton with the internal iOS microphone, if you can send the pink noise generator output to the sound system input. In this configuration, the internal generator is routed back to the input as the reference channel. You can measure delay, magnitude, and phase using this setup. When you use Transfer Function with a two-channel audio interface to run, such as the Studio Six Digital iAudioInterface2, then you can also use any audio source as the test signal, including music. See our website for more information.
LM AUDIO
This application allows users to control various audio settings for car amplifiers with integrated DSP. Adjust EQ, bass, 3D sound, time alignment, and filters. Save and load sound settings directly from your phone or the amplifier.
- DSP control
- EQ adjustment
- Bass and 3D sound settings
- Time alignment
- Filter control
- Save sound settings to phone
- Save sound settings to amplifier
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After connecting App to Car Amplifier with Integrated DSP, EQ, BASS, 3D SOUND,TIME ALIGNMENT, PHASE, MUTE, FILTER , SAVE SOUND SETTING TO PHONE, SAVE SOUND SETTING TO AMPLIFIER, LOAD SOUND SETTING FROM PHONE, RCA OUTPUT etc could be controlled through this App. How to use: 1.Install App and turn on power of car 2. Turn on Bluetooth on your iPhone 3,Open App and wait for around 5 seconds, then click “Connect” icon in left corner of bottom. Amplifier will be connected to App automatically. 4.DIY you preferred sound and then click “Save to AMP” icon to save. Or click “ Save to Phone” to save. Note: 1.Do not exit app during saving and do not turn off power supply, program may be shut down caused by this.
Screenshots
Verdict
The clearest difference is price: LM AUDIO at Free against Transfer Function's $49.99. LM AUDIO also leads on in-app purchases (none vs 1) and iOS requirement (7.0 vs 15.0). Transfer Function's advantage is review sentiment (25% vs 0%). On update cadence, ads 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
LM AUDIO is free to download; Transfer Function costs $49.99 up front. Transfer Function sells 1 one-off in-app purchase. LM AUDIO asks for nothing beyond the download.
Transfer Function ships an update every 6 months, LM AUDIO every 3 months. The most recent releases landed on September 24, 2026 and June 4, 2026 respectively.
| Parameter | Transfer Function | LM AUDIO |
|---|---|---|
| Price | $49.99 | Free — better |
| Rating | 3.0 (2 ratings) — better | — |
| Positive reviews | 25.0% of reviews — better | 0.0% of reviews |
| Number of ratings | 2 — better | — |
| Update frequency | Every 6 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.0 | 7.0 — better |
| Further details — not scored | ||
| Size | 33 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Andrew Smith | PT. Kramat Motor |
Customer experience
Transfer Function
LM AUDIO
In-app purchases
Transfer Function
- Reference Curves Option$14.99
LM AUDIO
No in-app purchases









