These 2 mods' names are quite confusing.
For example, "Double time" means the song length are doubled, thus the song should be slower. However, it became faster when enabled.
Therefore,
"Double time" should be renamed into "2x speed"
"Half time" should be renamed into "0.5x speed"
For example, "Double time" means the song length are doubled, thus the song should be slower. However, it became faster when enabled.
Therefore,
"Double time" should be renamed into "2x speed"
"Half time" should be renamed into "0.5x speed"