Published by Jean-Marc Desprez on Jul 3, 2024

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About FM Synthesizer [SynprezFM II]

1. Other performance parameters can be accessed above the keyboard, including 2 types of portamento, a sensitivity range for pitch or volume modulations, and some effects that give a sense of depth when using a headset, especially on plucked sounds.

2. It is possible to record WAV, to connect a MIDI keyboard (using a USB/OTG cable for Android Honeycomb 3. 1+, or Bluetooth Low Energy for Android Jelly Bean 4. 3+), and to take advantage of a small step sequencer.

3. SynprezFM 2 is a programmable polyphonic synth with a multitouch dynamic keyboard, arpeggio, effects and 1024 built-in instrument patches.

4. To simplify the classic usage, complex functions are now only available in 'expert mode' (activatable in the setup page): this regards the patch editor and the new micro-tuning feature.

5. SynprezFM 2 is also a Yamaha DX7 emulator, that can render with accuracy the sysex files you upload into an external storage directory setup by menu, in order to heighten the experience.

6. It uses Frequency Modulation, a lightweight method for generating complex harmonic waveforms by mixing or combining sine samples controlled by envelops and LFO.

7. While you play, you can trigger an after-touch vibrato effect by dragging your fingers on the active keys or shift the keyboard to different octaves.

8. It is able to produce analog style pads, to emulate classic or modern instruments, or to invent new and awesome crystalline sounds.

9. You can also create and save your own patches, either by editing one of the (deliberately) unsorted builtin ones, or starting from scratch with the 'init voice' function.

10. Even small devices can now leverage 2 synthesizers thanks to an optimized layout.

11. You can also adjust the polyphony to adapt to your device capabilities.

FM Synthesizer [SynprezFM II] Customer Insights

1. I'm using a Samsung Galaxy S10+.Really nice! I am blown away by what you can do with this mini board, a bit tricky to navigate being small but fully functional! Thank you to the creator great job putting this together.This is the mutts nuttz, I don't do reviews but ive just spent like 2.5 hours glued to the screen checking it out and kept finding more stuff by swiping left and right.

2. I like the sounds of the synthesizer, but the only problem is, the keys on the touchscreen is really small when zoomed out and I can't press 1 key without another key being hit next to it.

3. amazing little synth anyways, and it's cute to boot! thanks!Wonderful features with great sound, but I can't record what I play.

4. Although, I do sometimes miss keys, which is my problem, but sometimes I tend to turn on the gestures tab by tapping with 3 fingers at the bottom of my screen, which causes a glitch that freezes the keys I tapped on.

5. Is there a video tutorial or a user guide or anything that can help me.i appreciate all the effort the developer put into this handy little synth.

6. I think if there was a way to customize the piano so the keys are much wider when zoomed out this should help more when playing with the touchscreen.

7. Other then that it's really good especially when playing with an actual midi piano.Seems great but I seem to be missing functions.

8. I've also seen the video showing where it looks like somebody's looping something they have played but I have not been able to figure that out either.

9. However, I have not been able to figure out how to save sounds I have modified and created.

10. I tried writing a path to a newly made file in my phone to save to, but it doesn't work.

11. Loads of fun.Super cool app if you're into Synth music.

Steps to Troubleshoot & Fix FM Synthesizer [SynprezFM II] Issues

1. Fix FM Synthesizer [SynprezFM II] Not Working/Crashes/Errors/Unresponsive & Black/White screen:


  1. Restart FM Synthesizer [SynprezFM II]: Restarting the app will resolve most errors.
  2. Update the FM Synthesizer [SynprezFM II] App. Here is how:
    1. On Android goto PlayStore » Search for "FM Synthesizer [SynprezFM II]" » Open FM Synthesizer [SynprezFM II] » click "Update".
    2. On iPhone, goto AppStore » Your profile » Available Updates » Check for FM Synthesizer [SynprezFM II] » click "UPDATE".
  3. Clear FM Synthesizer [SynprezFM II] app cache: Clearing cached data will force your app to retrieve the latest data directly from FM Synthesizer [SynprezFM II] servers.
    1. On Android, goto Settings » Apps » Select "FM Synthesizer [SynprezFM II]" » click Storage » click "Clear Cache".
  4. Check FM Synthesizer [SynprezFM II] app permissions. If any of these permissions required to use your device's features are disenabled, FM Synthesizer [SynprezFM II] might not work.
  5. Uninstall and reinstall FM Synthesizer [SynprezFM II]. If nothing else has worked, completely uninstall FM Synthesizer [SynprezFM II] then reinstall.
  6. Restart your device. Last, restarting your device can often clear most problems causing FM Synthesizer [SynprezFM II] not working


2. Fix FM Synthesizer [SynprezFM II] Server issues & Internet Connection


  1. Check network connection: An unstable Internet will make FM Synthesizer [SynprezFM II] be unable to connect to it's servers. Ensure your wi-fi is working then restart app.
  2. Disable VPN: VPN can cause connection errors and lead to FM Synthesizer [SynprezFM II] not working. Make sure all VPNs are off
  3. Enable background data: When Background data is turned off, FM Synthesizer [SynprezFM II] may not be able to connect to the Internet when running in the background.

Reported Issues