BOSS Effect Loader vs SynthMaster 3 Player
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
BOSS Effect Loader
This application allows users to load effects into the PX-1 Plugout FX device. It offers a selection of free effects and the option to purchase additional model passes within the app. An internet connection and Roland Account are required for full functionality.
- Load effects into PX-1 Plugout FX
- 16 free effect models included
- Purchase additional model passes
- Bluetooth or USB connection
- Requires Roland Account
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● BOSS EFFECT LOADER is an app for loading effects into the PX-1 Plugout FX. * Need an internet connection and a registered Roland Account are required to use the BOSS EFFECT LOADER. ● The following 16 models are available for free use: OD-1/SP-1/PH-1/SG-/CS-1/TW-1/SD-1/DS-1/CE-2/OC-2/BF-2/PN-2/DD-2/DF-2 ● Additional Model Passes can be purchased within the app. ● Connect the BOSS PX-1 Plugout FX and your iPhone/iPad via Bluetooth® (*1) or USB cable (*2) to use this app. *1 Set up the Bluetooth connection in the Connection Window displayed after the app is launched. *2 When connecting to an iPhone/iPad equipped with a USB Lightning port, you will need Apple's genuine “Lightning to USB 3 Camera Adapter.”
SynthMaster 3 Player
This music app allows users to play and tweak a vast library of synthesizer presets. It offers a multi-layer architecture and extensive expansion content for diverse sound design possibilities. Users can easily browse and preview sounds before loading them.
- Tweak existing synthesizer presets
- Multi-layer architecture (up to 16 layers)
- Edit keyboard zones, velocity, voicing, unison, arpeggiator, FX
- Compatible with SynthMaster expansion banks
- In-app shop for purchasing expansions
- Preset previews with audio playback
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SynthMaster 3 Player iOS is the mobile player version of KV331 Audio's flagship synthesizer SynthMaster 3. It is tailored towards user who prefer tweaking existing presets over designing sounds from scratch. It is available for free on Apple AppStore as a standalone app and AUv3 plugin. Free Factory Content: SynthMaster 3 Player iOS comes with 200 presets curated from SynthMaster One, SynthMaster 2 and SynthMaster 3 factory libraries. Once users complete registration, the number of free presets increase to 500. Rich Expansion Content: SynthMaster 3 Player iOS is compatible with SynthMaster One, SynthMaster 2 and SynthMaster 3 expansions. There are currently 60 expansion banks for a wide range of genres to choose from. Users can easily purchase these expansions through the In-App Shop inside the app. Much more than a ROMpler synth: Although users can not edit layer modules and modulation sources, they can edit all other layer parts such as keyboard zones, velocity zones, voicing, unison, arpeggiator, sequencer and insert FX. Multi-layer Architecture: Each SynthMaster 3 Player iOS instance can have up to 16 layers. Users can add new layers by loading existing presets into layers through the preset browser. Preset Previews: Presets in SynthMaster 3 Player iOS have built-in previews. Users can listen to the previews of presets after turning on the preview mode. In-App Shop: Users can easily purchase expansion banks as in-app-purchases.
Screenshots
Verdict
The clearest difference is review sentiment: SynthMaster 3 Player at 87% against BOSS Effect Loader's 42%. SynthMaster 3 Player also leads on rating (4.7 vs 3.5) and update cadence (weekly vs every 5 months). On price, 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
Both are free to download. BOSS Effect Loader sells 8 one-off in-app purchases and SynthMaster 3 Player sells 14 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
SynthMaster 3 Player holds the better App Store score, 4.7 against 3.5. That said, the two scores are not equally well evidenced: SynthMaster 3 Player has 55 ratings behind it against 8, so its average is the more settled of the two. Written reviews point the same way: 42% of BOSS Effect Loader's written reviews are positive against 87% of SynthMaster 3 Player's.
BOSS Effect Loader ships an update every 5 months, SynthMaster 3 Player weekly. Both last shipped on September 28, 2026.
| Parameter | BOSS Effect Loader | SynthMaster 3 Player |
|---|---|---|
| Price | Free | Free |
| Rating | 3.5 (8 ratings) | 4.7 (55 ratings) — better |
| Positive reviews | 41.7% of reviews | 86.7% of reviews — better |
| Number of ratings | 8 | 55 — better |
| Update frequency | Every 5 months | Weekly — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 15 — better |
| Further details — not scored | ||
| Size | 3 MB | 2.2 GB |
| Age rating | 4+ | 4+ |
| Developer | Roland Corporation | KV331 Audio |
Customer experience
BOSS Effect Loader
SynthMaster 3 Player
In-app purchases
BOSS Effect Loader
- PW-2 Power Driver$9.99
- XT-2 Xtortion$9.99
- CS-2 Compression Sustainer$9.99
Show 5 moreShow fewer
- DM-2 Delay$9.99
- DC-2 Dimension C$9.99
- OD-2 TURBO OverDrive$9.99
- Bundle for PW-2/XT-2/CS-2$19.99
- Bundle for OD-2/DC-2/DM-2$19.99
SynthMaster 3 Player
- New Loops Psytrance Sounds Volume 1$2.99
- NatLife Melodic Techno Sounds Vol 1$2.99
- New Loops Cinematic Sounds Volume 1$2.99
Show 11 moreShow fewer
- New Loops Synthwave Sounds Volume 1$2.99
- Loopsy Rave Sounds Volume 1$2.99
- Luftrum 33$2.99
- SynthMaster 2 Factory Presets$4.99
- SynthMaster 3 Factory Presets$4.99
- Loopsy Tech House Sounds Volume 1$4.99
- Loopsy House Sounds Volume 1$4.99
- SynthMaster 3 Expansions Bundle$12.99
- SynthMaster One Expansions Bundle$14.99
- SynthMaster Factory Presets Bundle$14.99
- SynthMaster Everything Bundle$69.99
