For some reason Optifine is conflicting with my mod and whenever I go to use a custom music disk it just doesn't play but the text will show up. Any ideas?

No ideas. Do you have any other mods installed?

Nope just tested with Optifine. It works on vanilla so it must be that.

If I'm not mistaken, all that is required for adding sound in 1.7.10 is the sounds.json correct?

 

Here it is anyway:

 

 

{

    "rip": {"category": "master","sounds": ["block/rip1","block/rip2","block/rip3"]},

    "snowGlobe": {"category": "master","sounds": ["misc/snowGlobe"]},

    "star": {"category": "master","sounds": ["misc/star"]},

    "jingleBells": {"category": "master","sounds": [{"name": "records/jingleBells","stream": true}]},

    "deckTheHalls": {"category": "master","sounds": [{"name": "records/deckTheHalls","stream": true}]},

    "golemSay": {"category": "master","sounds": ["mob/miniGolem/golemSay1","mob/miniGolem/golemSay2","mob/miniGolem/golemSay3"]},

    "golemStep": {"category": "master","sounds": ["mob/miniGolem/golemStep1","mob/miniGolem/golemStep2","mob/miniGolem/golemStep3"]},

    "golemHurt": {"category": "master","sounds": ["mob/miniGolem/golemHurt1","mob/miniGolem/golemHurt2","mob/miniGolem/golemHurt3"]},

    "golemDeath": {"category": "master","sounds": [{"name": "mob/miniGolem/golemDeath","stream": false}]},

    "gingerBreadHit": {"category": "master","sounds": ["mob/gingerbreadMan/gingerBreadHit1","mob/gingerbreadMan/gingerBreadHit2","mob/gingerbreadMan/gingerBreadHit3"]},

    "gingerBreadDeath": {"category": "master","sounds": [{"name": "mob/gingerbreadMan/gingerbreadDeath","stream": false}]},

    "penguinSay": {"category": "master","sounds": ["mob/penguin/penguinSay1","mob/penguin/penguinSay2","mob/penguin/penguinSay3"]},

    "penguinHurt": {"category": "master","sounds": [{"name": "mob/penguin/penguinHurt","stream": false}]},

    "penguinDeath": {"category": "master","sounds": [{"name": "mob/penguin/penguinDeath","stream": false}]},

    "bearSay": {"category": "master","sounds": ["mob/polarBear/bearSay1","mob/polarBear/bearSay2","mob/polarBear/bearSay3"]},

    "bearHurt": {"category": "master","sounds": ["mob/polarBear/bearHurt1","mob/polarBear/bearHurt2","mob/polarBear/bearHurt3"]},

    "bearDeath": {"category": "master","sounds": [{"name": "mob/polarBear/bearDeath","stream": false}]},

    "reindeerSay": {"category": "master","sounds": ["mob/reindeer/reindeerSay1","mob/reindeer/reindeerSay2"]},

    "reindeerHurt": {"category": "master","sounds": ["mob/reindeer/reindeerHurt1","mob/reindeer/reindeerHurt2"]},

    "reindeerDeath": {"category": "master","sounds": [{"name": "mob/reindeer/reindeerDeath","stream": false}]},

    "albinoReindeerSay": {"category": "master","sounds": ["mob/albinoReindeer/albinoReindeerSay1","mob/albinoReindeer/albinoReindeerSay2"]},

    "albinoReindeerHurt": {"category": "master","sounds": ["mob/albinoReindeer/albinoReindeerHurt1","mob/albinoReindeer/albinoReindeerHurt2"]},

    "albinoReindeerDeath": {"category": "master","sounds": [{"name": "mob/albinoReindeer/albinoReindeerDeath","stream": false}]},

    "calendar": {"category": "master","sounds": ["block/calendar1","block/calendar2"]},

    "snowGlobeTap": {"category": "master","sounds": ["block/snowGlobeTap"]},

    "santa": {"category": "master","sounds": ["misc/santa"]}

}

 

 

Oh yeah. Sorry I forgot all about that. Here it is:

 

package wintercraft.items;

import net.minecraft.client.renderer.texture.IIconRegister;
import net.minecraft.item.ItemRecord;
import net.minecraft.util.ResourceLocation;
import wintercraft.Wintercraft;
import cpw.mods.fml.relauncher.Side;
import cpw.mods.fml.relauncher.SideOnly;

public class ItemChristmasMusicDisk extends ItemRecord{

    public ItemChristmasMusicDisk(String recordName) {
	super(recordName);
	this.setCreativeTab(Wintercraft.WintercraftTab);
	this.maxStackSize = 1;
    }
   
    @Override
    public ResourceLocation getRecordResource(String name)
    {
        return new ResourceLocation(recordName);
    }
    
    @SideOnly(Side.CLIENT)
    public void registerIcons(IIconRegister par1IconRegister)
    {
        this.itemIcon = par1IconRegister.registerIcon(Wintercraft.modid + ":" + this.getUnlocalizedName().substring(5));
    
    }
}

Alright, thanks for looking at it.

What version of Optifine are you using?  1.7.10 A4 was really buggy for me and caused a lot of mods to stop working.  The newest version which I think came out today has some bug fixes.  Version 1.7.10 B1.  Refer to http://www.minecraftforum.net/forums/mapping-and-modding/minecraft-mods/1272953-optifine-hd-b2-fps-boost-hd-textures-aa-af-and