Music Maker I use: https://play.google.com/store/apps/details?id=com.bandlab.bandlab
Music Maker JAM: https://www.justaddmusic.net/en/index.html
MP3 Volume Change: https://www.onlineconverter.com/increase-mp3-volume
Audio Converter: https://online-audio-converter.com/
Trim MP3 Files: https://audiotrimmer.com/
Tempo Changer: https://audiotrimmer.com/audio-speed-changer/
65 More Online Tools: https://hyperbitsmusic.com/65-online-tools-for-music-producers-and-artists/
ColBreakz 
SnoodDood