Mach Speed Technologies TRIO V2400 - Manual (Page 11)

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recording, pause the file and briefly press the [MENU] button.
While in standby mode, you can press [MENU] to enter the
Recorder submenu.
Recorder Submenu (pictured below)

Record Format- allows you to save your voice
recordings either in .WAV or .MP3 format

Record Quality- Allows you to set your recording
quality. Higher quality recordings will be larger files

Record Gain- Allows you to set your record gain

Save Path- Allows you to select where so save your
voice recordings