Q: I purchased Neutron via PayPro but still getting Trial Expire, how to fix it?

Make sure Neutron is downloaded and installed from here. Check if e-mail account is listed in Neutron's settings -> Help -> Account. If not, try adding it via OS settings as POP3/IMAP e-mail account. If it does not help, account is already added but Neutron does not see it and Neutron has permission provided to access device accounts, then you could try adding account manually via Help -> Account -> [+]:

For example for 163.com service it would be:

  • Address for POP: pop3s://pop.163.com, or for IMAP: imaps://imap.163.com
  • Username: This e-mail address is being protected from spambots. You need JavaScript enabled to view it.
  • Password: password for  This e-mail address is being protected from spambots. You need JavaScript enabled to view it. account in 163.com service

Also make sure that access to the account via POP/IMAP protocol is enabled in the mail service settings:

If Neutron failed to validate (login) the account it will be shown with yellow color in the list.

Q: Why Neutron stops playing when screen is switched off on Huawei/Honor device?

It is unfortunately for all music apps developers an "extended functionality" of the firmware which suspends app as soon as it is sent to background without regards that app requests foreground priority. To fix this behavior go to OS settings -> Battery -> Applications -> Neutron -> switch off "Manage automatically" -> make sure you enabled "Run in background" in the manual setting list.


Q: Are there any themes for Neutron which could change its Look and Feel?

Themes are not supported but you can adjust UI appearance, colors and transparency of UI elements, through the settings: Settings -> User Interface -> Appearance.


Q: On each track change the sound becomes overloaded (too loud) and then becomes again normal, is it a bug?

No, it is not a bug. Most probably you misused the Preamp. You can fix it as following:

  1. Make sure that in Controls screen you have Preamp slider in the middle position (0 dB).
  2. Go to Neutron UI -> Settings -> Automatic Gain Protection -> check if RESET GAIN value is 0 dB, if not, reset it to 0 dB with the slider.


Q: How to create my own playlist and add tracks to it?

Swipe to the Playlist screen (right most) -> go to top-level list by pressing [ enter to Playlists section and press [+] button -> you will notice newly created playlist entry. Then from other lists of tracks simply long press on song or group (album, artist, ...) and press [+ PLAYLIST] button -> in the list find playlist to which you are going to add entries, select it and confirm.


Q: Where is the file of a newly created playlist stored?

Playlist files which are created by Neutron are stored in the following locations:

  • Android OS: /Android/data/com.neutroncode.mp/playlists, or /NeutronMP/playlists
  • BlackBerry OS: /shared/music/playlists


Q: How to transfer files to Neutron via network?

Neutron's settings -> Network -> FTP -> select source entry which will be managed by FTP server. You will notice IP address, generated username and password. On another device use any FTP client -> enter IP, username and password -> manage files via FTP client. Neutron will auto-refresh source entry if it is modified by FTP and has the Refresh button switched on.


Q: After uninstallation and then reinstallation I have all my settings are lost. Is it possible to avoid it?

A: To avoid loosing your settings follow these steps:

  • Android OS: close Neutron process -> create folder NeutronMP in the root of the internal storage -> start Neutron -> Neutron will copy its current setting files to /NeutronMP folder and will use setting files which are located in /NeutronMP.
  • BlackBerry OS: close Neutron process -> create folder NeutronMP in the internal storage inside the /misc folder (you will get /misc/NeutronMP) -> start Neutron -> Neutron will copy its current setting files to /misc/NeutronMP folder and will use setting files which are located in /misc/NeutronMP.

Even if you completely uninstall Neutron that custom folder will not be deleted by the OS and after re-installation all settings will be preserved. On start Neutron will try to find that custom folder and load settings from it, if failed the standard location will be used.


Q: How to avoid playing ringtones and other audio files with non-music content?

A: You can do it in two ways:

  1. Go to Playlist screen, scroll to Folders group, enter to it and find those folders which are not related to music, long-press on such folders and in opened window press IGNORE button. After this operation unneeded audio files will be removed from the database. Repeat the same operation for all non-music folders.
  2. Re-create Source entry. Go to Playlist screen, scroll to Sources group, and enter to it then long-press on Source #N entry, in opened window press DELETE button. Return to Sources, enter to it and press NEW button in the bottom of the screen, in opened window scroll to music folders and select them with pin-button. Select only top-level folders (for example: if you have /sdcard/music folder, select it and not folders below this folder), multiple selection is supported. After selection is done press DONE button and Neutron will rescan selected music folders.


Q: Is there support for streaming audio?

A: Yes, there is. Navigate with Internet browser to the link you would like to stream, press on it, Android OS will offer the list of apps to open that link, choose Neutron from that list, Neutron will start and on its Display will be saying CONNECTING..., if format is supported it will start playing the stream. All streaming URLs opened like that will be saved in Streaming group in Playlist screen (below Queue group). Also it is saved in XML file: /Android/data/com.neutroncode.mp/streaming.xml. It is possbile to edit this XML file manually and add/fill the list of URLs there. If it is non-Android platform then streaming.xml can be located in a custom NeutronMP folder (see Q: After uninstallation and then reinstallation I have all my settings are lost. Is it possible to avoid it?)


Q: I can see basic controls on Playing Now screen but how do I access music selection?

A: Neutron is not traditional Android application. It has screens on the right and left sides from the Playing Now screen. To switch between screens press on Display area or anchors on screen borders. Swiping the screen also works.


Q: I do not see album art, does Neutron support it?

A: Yes. Neutron builds own media database and searches for an album art in: folders where music files are located, or tags of music files. On iOS platform Neutron will get album art images for the iTunes tracks from the iTunes library. On Android platform system media library is not supported.


Q: If I set Preamp gain above slider's middle position sound becomes distorted.

A: Preamp gain control is digital amplification mechanism. To adjust analogue gain of your device (loudness of speakers) you shall use device up/down volume buttons, or Neutron’s Master HW gain. Digital gain in normal circumstances shall not be increased above middle position of slider (>0 dB). Normal circumstances mean when audio is normalized (usually all commercial music is normalized). Using digital gain above slider's middle position (>0 dB) makes sense only if your audio is not normalized and is quieter than usual, for example if you are listening to custom recording. Amplifying normalized audio signal by using digital gain will lead to its guaranteed distortion. Use digital Preamp to decrease audio gain only if you increase gain of some frequencies by equalizer. Use it with care and when you know what are you doing! Otherwise simply use standard hardware volume controls and do not care about it.


Q: What does Surround mode mean?

A: Surround mode is using Ambiophonic R.A.C.E. algorithm to make stereo music spatial (3D like). It must be used with external speakers only because Ambiophonic R.A.C.E. technique supposes that audio frequencies of music composition will be mixed in the air before arriving to listener. The way such mixing is done causes effect of the surround sound.


Q: What does Crossfeeding feature do?

A: Crossfeeding is the special technique which mixes some frequencies of Left and Right channels of stereo music together. Crossfeeding must be used with headphones only and its goal is to simulate stereo perception of external speakers. Explanation: All music is composed with condition that it will be listened through external speakers thus composer takes into account that some frequencies of Left and Right channels will be mixed in the air before arriving to the listener. If listener is using headphones then no such mixing in the air happens and thus desired perception of the music composition is not achieved. Crossfeeding technique simulates such mixing and thus listener is able to feel music as if it is heard from the external speakers, e.g. in the same way as music composer planned it to be heard. Neutron provides several presets with different degree of mixing. Choose whatever preset you like or adjust to your own taste.


Q: Crossfeeding button is replaced when Surround mode becomes active?

A: Yes. Crossfeeding and Surround modes are mutually exclusive by operation, Surround widens stereo while Crossfeeding is narrowing it.


Q: Why do I need to know about Resampling?

A: Generally speaking, you don't. Until the moment when you get music files which have frequency other than 44.1kHz. Android OS is hard-coded to 44.1kHz frequency, e.g. if you have music files with the same frequency then no resampling happens. But if you get music with 48kHz frequency, or Studio quality music with 96kHz frequency then the real-time resampling will take place. Neutron provides 3 resampling methods which can be chosen depending on performance of your device.


Q: Can I change or stop music in Landscape mode?

A: Yes. Tap on bottom side of the screen and the sliding panel with playback controls will come out. Note, when NIGHT mode is active you won't be able to invoke this panel.


Q: I see WAKE button but how to setup wake-up time?

A: Simply long press WAKE button. Dialog window will appear with necessary controls. It is also accessible through Settings screen.


Q: Is it possible to delete Source entry?

A: Yes. Go to Playlist screen, press on Sources group and you will see all existing Source entries. Long press the entry you wish to delete, in opened window press the DELETE button.


Q: Can I register more directories which have music files?

A: Yes. Long press the Source #N entry and in opened window press the EDIT button to invoke directory selection mode.


Q: Can I create more sources to link some other directories which contain music files?

A: Yes. Go to the media library top-level list (Albums, Artists,...), scroll to the Sources group, enter to it. In the bottom press the [+] button to create new source entry -> File System -> browse folders -> select top-level music folder -> confirm.


Q: I copied new music to the directory referenced by one of the Source entries but music does not appear in Neutron automatically.

A: It is intended behavior. Neutron does not scan anything on your device by itself automatically and it does not do anything in background with goal to save the battery lifetime and CPU power of your device. If you modified contents of the music directory: go to the Media Library screen -> scroll the list to the Sources group -> go inside Sources -> on each source entry switch off/on the [Refresh] button and wait until Neutron completes scanning. [Refresh] will only trigger quick scan of the missing/added music and album art files. For a complete database re-scan you need to long press source entry -> [SCAN].


Q: How do I connect to my network device via SMB/CIFS or UPnP/DLNA?

A: For that you need to access the Media Library list (Playlists, Albums, Artists, ...) which is on the right from the Playing Now (central) screen and scroll it to the bottom to the Sources entry -> tap on Sources -> press [+] button in the bottom panel:

  • for SMB/CIFS: tap on Network -> Network View -> tap on network interface IP -> wait while Neutron enumerates network and shows found IPs -> tap on found end-points to browse their file system and select top-level music folder. By long pressing the IP entry you can alter username/password for it if that is required;
  • for UPnP/DLNA: tap on UPnP/DLNA -> wait until Neutron lists your network devices -> tap on found device -> select top-level category or folder which guarantees non duplicate music tracks -> confirm for scanning.


Q: I modified metadata (tags) of some music files but do not see the changes in Neutron.

A: Go to the Media Library screen -> long press on source entry -> [SCAN].


Q: Does Neutron download album art from the Internet?

A: No. Neutron looks for the album art in the directory with music files or extracts it from the metadata of the music file. There are many applications which are specializing on album art downloads. It does not make sense to duplicate such functionality in Neutron.


Q: How to complete close Neutron app so it becomes unloaded from the memory?

A: Make sure Settings -> Service option is switched off. After exiting from the UI Neutron will run in background for some 5-30 minutes (depending on running background tasks) and will do self exit automatically. There are background tasks which block self exit: music playback, wake timer, normalization queue, license checking.


Q: How to save power on Android(*) when using Neutron?

  1. Download and install NEON APK which is using parallel calculations and thus is 25-50% faster
  2. Prefer 32-bit mode as ARM32 platform does not have NEON instructions for 64-bit floating point math (ARM64 is already optimal for 64-bit math or any x86 CPU in Android phone/tablet which has SSE/SSE2).

(*) Other platforms have application packages optimized with NEON instructions by default.


Q: I own a Sailfish OS powered device, purchased license using PayPro option and installed Neutron's APK (NeutronMP_NEON.apk) but after some time Neutron shows Trial Expired message. How could I fix it?.

A: Install an Android mail client application, add your POP3/IMAP account and make it working (sending/receiving e-mails). Restart Neutron and it will be able to get your e-mail account from the OS for license verification purpose. See the related discussion here.


Q: I found a bug how can I report it?

A: Your kind help is appreciated very much! Reporting bug along with details to reproduce it helps to develop a fix in Neutron in a very short time. You can do it by sending e-mail to This e-mail address is being protected from spambots. You need JavaScript enabled to view it. , or by creating a thread in Neutron's dedicated Forum. Bug reports in the comments of Google Play, App Store, BlackBerry World and other stores provide very little information, do not hesitate to contact directly with the developer.