Finding super voice recorder files on computer AFTER it was created on my android 8
I Assume, you are using Super Voice Recorder from MeiHillMan.

He has mentioned the storage location of your files in 


Play Store Page

Audio recording files are stored into “AllVoiceRecords” in your SD card 
  root folder. In addition to using the built-in player, you can use your device’s file browser or a USB PC connection to view, copy or share the files in the directory.
Android Application




On Windows, if you can't see your files from Explorer, and you're familiar with ADB, open CMD shell and try this command:

adb pull /sdcard/AllVoiceRecords %userprofile%\desktop


You'll find a folder called AllVoiceRecords on your desktop

Otherwise, if you want to view your files via Windows Explorer, try media.Re.Scan application to scan your MTP media storage and update its information.