hldj.org

1) Does HLDJ launch the game correctly for you? Yes
2) Does "HLDJ Loaded Successfully" appear in console on starting the game (with no errors)? Yes
3) What is the console output after selecting a song, or issuing other HLDJ commands such as "hldj_next"?
] 6
Host_WriteConfiguration: Wrote cfg/hldj_cmd_b.cfg
Loaded : sample_src

4) Create your own local server and set the appropriate sv_ commands (see above), then:
4-a) Load one of the sample audio files and perform a search of your Steam directory (without stopping HLDJ) for the file "voice_input.wav" - does it show up, and if so, where? Yes it does.
C:\Program Files (x86)\Steam\steamapps\myusername\team fortress 2
4-b) If it exists, open it in an audio player: does it sound like the audio file you loaded? Yes
4-c) If it exists, return to the game, and enter the following into console:
Does the audio file start to play? No it plays my voice.
5) Does voice normally work for you? If not, or you do not have a mic, have you remembered to set up any applicable options in your operating system and/or the game? Yes voice normally works for me.

Edit: I am using
hldj 1.6.02 64-bit
Edit 2: I know I set up the files correctly as it worked once and then stopped working for some reason.
Edit 3: It is on Team Fortress 2 Premium user.

4-c = no --> the server has not been configured correctly. refer to the sticky/rules on the cvars that need to be enabled.

It has, it is either the cvars on the sticky are wrong or it just isn't working, because I clicked select all and then copied them into the console directly so no clue what is wrong.

if you're 100% sure you're setting up the server correctly, then something could be wrong with the game. Try disabling Steam Cloud and re-installing the game.