.3ga
3GPP audio
An audio-only file in the 3GPP mobile container, typically holding AMR or AAC speech. Some Android voice recorders, notably on older Samsung phones, save to it.
Voice and call recordings from older Android phones.
Opens in VLC, mpv, Audacity with FFmpeg
About 3GA files.m4a
M4A audioMPEG-4 Audio
An MPEG-4 file that holds only audio, usually AAC and sometimes Apple Lossless (ALAC). Apple popularised it for songs bought and ripped in iTunes.
Music on Apple devices, iPhone voice memos and ringtone sources.
Opens in Music, QuickTime, iPhone, Windows Media Player, VLC
About M4A files