Q to decrease volume L to increase volume M to mute Spacebar to set volume to 100%
https://ia802907.us.archive.org/29/items/undertaleost_202004/Undertale%20-%20Lossless%20Soundtrack%20%28toby%20fox%29/toby%20fox%20-%20UNDERTALE%20Soundtrack%20-%2014%20Heartache.mp3
