Certain midi BGMs are delayed slightly on PS Vita

[pspkurara]

Name of the game:

nobita_hazard (jp name: のび太のバイオハザード)

Player platform:

PS Vita

Attach files (as a .zip archive or link them)

• A savegame next to the problem
  Save01.zip
• The easyrpg_log.txt log file
  easyrpg_log.txt

Describe the issue in detail and how to reproduce it:

Issue

• When I start playing certain background music it delays and then returns.
• It looks like a gate effect has been applied (It is muted and played in pieces at very short intervals.), so I think the problem is an internal buffer shortage, but I don't know the actual cause.
• A phenomenon occurs from the following sound source files in the game. (Currently, I have only been able to confirm this sound source, and it has not occurred with other BGMs that can be confirmed through the current game progress.)
  nobita_hazard/Music/闇の通路.mid
• I thought one way would be to convert it to something like mp3, but when I play it back on Windows, the sound source of the instrument is slightly different, so I think it's better to play it as midi as possible.

How to reproduce

1. Download and install the latest EasyRPG-Player for vita from below.
   https://easyrpg.org/player/downloads/#release-other

2. Install RTP2000 and copy its contents to ux0:data/easyrpg-player/rtp/2000.
   DL => https://cdn.tkool.jp/updata/rtp/2000rtp.zip
   The manual says that only 2000 is required, but in my environment I also have 2003 installed. (I don't think it's necessary, but I'll include it to ensure reproducibility)
   https://cdn.tkool.jp/updata/rtp/2003rtp.zip

3. Download the game below and install it as follows. (The original distribution site is dead, so please download from this link)
   https://ux.getuploader.com/nobihazahokan/download/91

4. The data is arranged as below, but considering the contents, it may occur in other cases as well.
   nobita_hazard.zip/nobita_hazard to ux0:/data/easyrpg-player/Nobita no Biohazard 1.0
   Please note that I am renaming the folder name. (But I don't think it's directly related)

5. Install the save data.
   Unzip and save Save01.lsd inside to ux0:/data/easyrpg-player/Nobita no Biohazard 1.0

6. Run the Nobita no Biohazard 1.0 game as usual
   No settings were changed except for Keyconfig.

7. Select LOAD GAME from the title screen to load the first save data.

8. When you load the first save data, you will be moved to a room like the image.
   Operate the player to go out through the door at the location of the image.
   

9. Move to the right with the right arrow key
   avoid zombies
   

10. Continue moving to the right
    

11. Enter from this entrance by pressing the direction key
    

12. Please listen to music in this room for a while.
    (Please be careful of zombies while waiting)
    When the music plays for about 25 seconds, the delay becomes progressively worse (it becomes like a gate effect is applied).
    If you continue playing until the second half, it will recover rapidly and the problem will not occur after that.
    Occurs every time a different BGM is loaded by moving a room, etc., and the BGM starts playing again after returning to the original room.